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Electrostatics(GPT) Flashcards

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1
Q

What is electrostatic force?

A

Electrostatic force is the force of attraction or repulsion between two charged objects due to their electric charges.

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2
Q

What law describes the force between two point charges?

A

Coulomb’s Law describes the force between two point charges.

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3
Q

State Coulomb’s Law.

A

Coulomb’s Law states that the electrostatic force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

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4
Q

Write the formula for Coulomb’s Law.

A

F = k \frac{|q_1 q_2|}{r^2}, where F is the force, q_1 and q_2 are the charges, r is the distance between charges, and k is Coulomb’s constant.

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5
Q

What is the value of Coulomb’s constant k?

A

Coulomb’s constant k is approximately 8.99 × 10^9 Nm^2/C^2.

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6
Q

What are the units of electric charge?

A

Electric charge is measured in coulombs (C).

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7
Q

What is the direction of the electrostatic force between two like charges?

A

The electrostatic force between two like charges is repulsive; they push each other away.

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8
Q

What is the direction of the electrostatic force between two opposite charges?

A

The electrostatic force between two opposite charges is attractive; they pull each other together.

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9
Q

Define electric field.

A

An electric field is the region around a charged object within which other charges experience an electrostatic force.

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10
Q

How is the electric field due to a point charge defined mathematically?

A

The electric field E due to a point charge Q at a distance r is E = k \frac{|Q|}{r^2}.

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11
Q

What is the unit of electric field strength?

A

The unit of electric field strength is newtons per coulomb (N/C).

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12
Q

How is electric field intensity vector direction defined for a positive point charge?

A

The electric field vector points radially outward from a positive point charge.

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13
Q

How does the electric field vector point for a negative point charge?

A

The electric field vector points radially inward toward a negative point charge.

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14
Q

What is the principle of superposition in electrostatics?

A

The principle of superposition states that the net electrostatic force on a charge is the vector sum of all individual forces acting on it from other charges.

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15
Q

How do you calculate the net force on a charge when multiple charges are present?

A

Calculate each pairwise force using Coulomb’s Law, then add the forces vectorially to find the net force.

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16
Q

Define electric field strength at a point.

A

Electric field strength at a point is the force experienced per unit positive charge placed at that point.

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17
Q

Write the formula relating electric field E, force F, and charge q.

A

E = \frac{F}{q}, where F is the force on the charge and q is the magnitude of the test charge.

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18
Q

What happens to the electrostatic force if the distance between two charges doubles?

A

The force becomes one-fourth of the original force because it varies inversely with the square of the distance.

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19
Q

What happens to the electrostatic force if the magnitude of one charge is doubled?

A

The force doubles because it is directly proportional to the product of the charges.

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20
Q

What is a test charge?

A

A test charge is a small positive charge used to detect or measure the electric field without disturbing the original field.

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21
Q

Why must a test charge be small?

A

To ensure it does not alter the electric field being measured.

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22
Q

What does an electric field line represent?

A

An electric field line represents the path along which a positive test charge would move under the influence of the field.

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23
Q

Describe the density of electric field lines and its significance.

A

The density of electric field lines indicates the strength of the electric field; closer lines mean stronger fields.

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24
Q

Can electric field lines cross? Why or why not?

A

No, electric field lines cannot cross because at any point the electric field has a unique direction.

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25
What is the difference between a conductor and an insulator in terms of electric charge?
Conductors allow free movement of electric charges; insulators do not allow charges to move freely.
26
What happens when two identical charges are placed at some distance in terms of force magnitude?
They exert equal and opposite repulsive forces on each other of the same magnitude.
27
How is the electrostatic force a vector quantity?
Because it has both magnitude and direction.
28
How do charges influence each other's electric fields?
Each charge produces an electric field that affects other charges, resulting in forces between them.
29
Are electrostatic forces stronger at short or long distances?
Electrostatic forces are stronger at short distances due to the inverse square relationship with distance.
30
What is the effect on electric field at a point moving further from a single positive charge?
The electric field strength decreases as the distance from the charge increases.
31
How do electric field lines behave near a positive point charge?
Electric field lines radiate outward symmetrically from the positive charge.
32
How do electric field lines behave near a negative point charge?
Electric field lines converge inward toward the negative charge.
33
What is the relation between electric potential and electric field?
The electric field is the negative gradient of electric potential; it points in the direction of greatest decrease of potential.
34
Is electrostatic force a non-contact force? Explain.
Yes, because it acts between charges without physical contact.
35
How does the magnitude of the electrostatic force change with charge sign?
The magnitude depends on the product of the charges’ magnitudes; the sign determines attraction or repulsion.
36
State the direction of force on a positive test charge placed in an electric field.
The force on a positive test charge is in the direction of the electric field.
37
State the direction of force on a negative test charge placed in an electric field.
The force on a negative test charge is opposite to the direction of the electric field.
38
What principle explains the interactions between many charges in a system?
The principle of superposition explains how forces from multiple charges combine vectorially.
39
How does introducing a medium other than vacuum affect the electrostatic force?
Introducing a medium with permittivity reduces the electrostatic force compared to the force in vacuum.
40
Define Coulomb's law
State Coulomb's law: The magnitude of the electrostatic force exerted by one point charge (Q1) on another point charge (Q2) is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance (r) between them.
41
Define an electric field
Describe an electric field as a region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive test charge would move if placed at that point.
42
Define the electric field at a point
Define the electric field at a point: The electric field at a point is the electrostatic force experienced per unit positive charge placed at that point.
43
What is electrostatic force?
Electrostatic force is the force of attraction or repulsion between two charged objects due to their electric charges.
44
What law describes the force between two point charges?
Coulomb's Law describes the force between two point charges.
45
State Coulomb's Law.
Coulomb's Law states that the electrostatic force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
46
Write the formula for Coulomb's Law.
F = k \frac{|q_1 q_2|}{r^2}, where F is the force, q_1 and q_2 are the charges, r is the distance between charges, and k is Coulomb's constant.
47
What is the value of Coulomb's constant k?
Coulomb's constant k is approximately 8.99 × 10^9 Nm^2/C^2.
48
What are the units of electric charge?
Electric charge is measured in coulombs (C).
49
What is the direction of the electrostatic force between two like charges?
The electrostatic force between two like charges is repulsive; they push each other away.
50
What is the direction of the electrostatic force between two opposite charges?
The electrostatic force between two opposite charges is attractive; they pull each other together.
51
Define electric field.
An electric field is the region around a charged object within which other charges experience an electrostatic force.
52
How is the electric field due to a point charge defined mathematically?
The electric field E due to a point charge Q at a distance r is E = k \frac{|Q|}{r^2}.
53
What is the unit of electric field strength?
The unit of electric field strength is newtons per coulomb (N/C).
54
How is electric field intensity vector direction defined for a positive point charge?
The electric field vector points radially outward from a positive point charge.
55
How does the electric field vector point for a negative point charge?
The electric field vector points radially inward toward a negative point charge.
56
What is the principle of superposition in electrostatics?
The principle of superposition states that the net electrostatic force on a charge is the vector sum of all individual forces acting on it from other charges.
57
How do you calculate the net force on a charge when multiple charges are present?
Calculate each pairwise force using Coulomb's Law, then add the forces vectorially to find the net force.
58
Define electric field strength at a point.
Electric field strength at a point is the force experienced per unit positive charge placed at that point.
59
Write the formula relating electric field E, force F, and charge q.
E = \frac{F}{q}, where F is the force on the charge and q is the magnitude of the test charge.
60
What happens to the electrostatic force if the distance between two charges doubles?
The force becomes one-fourth of the original force because it varies inversely with the square of the distance.
61
What happens to the electrostatic force if the magnitude of one charge is doubled?
The force doubles because it is directly proportional to the product of the charges.
62
What is a test charge?
A test charge is a small positive charge used to detect or measure the electric field without disturbing the original field.
63
Why must a test charge be small?
To ensure it does not alter the electric field being measured.
64
What does an electric field line represent?
An electric field line represents the path along which a positive test charge would move under the influence of the field.
65
Describe the density of electric field lines and its significance.
The density of electric field lines indicates the strength of the electric field; closer lines mean stronger fields.
66
Can electric field lines cross? Why or why not?
No, electric field lines cannot cross because at any point the electric field has a unique direction.
67
What is the difference between a conductor and an insulator in terms of electric charge?
Conductors allow free movement of electric charges; insulators do not allow charges to move freely.
68
What happens when two identical charges are placed at some distance in terms of force magnitude?
They exert equal and opposite repulsive forces on each other of the same magnitude.
69
How is the electrostatic force a vector quantity?
Because it has both magnitude and direction.
70
How do charges influence each other's electric fields?
Each charge produces an electric field that affects other charges, resulting in forces between them.
71
Are electrostatic forces stronger at short or long distances?
Electrostatic forces are stronger at short distances due to the inverse square relationship with distance.
72
What is the effect on electric field at a point moving further from a single positive charge?
The electric field strength decreases as the distance from the charge increases.
73
How do electric field lines behave near a positive point charge?
Electric field lines radiate outward symmetrically from the positive charge.
74
How do electric field lines behave near a negative point charge?
Electric field lines converge inward toward the negative charge.
75
What is the relation between electric potential and electric field?
The electric field is the negative gradient of electric potential; it points in the direction of greatest decrease of potential.
76
Is electrostatic force a non-contact force? Explain.
Yes, because it acts between charges without physical contact.
77
How does the magnitude of the electrostatic force change with charge sign?
The magnitude depends on the product of the charges’ magnitudes; the sign determines attraction or repulsion.
78
State the direction of force on a positive test charge placed in an electric field.
The force on a positive test charge is in the direction of the electric field.
79
State the direction of force on a negative test charge placed in an electric field.
The force on a negative test charge is opposite to the direction of the electric field.
80
What principle explains the interactions between many charges in a system?
The principle of superposition explains how forces from multiple charges combine vectorially.
81
How does introducing a medium other than vacuum affect the electrostatic force?
Introducing a medium with permittivity reduces the electrostatic force compared to the force in vacuum.
82
Define Coulomb's law
State Coulomb's law: The magnitude of the electrostatic force exerted by one point charge (Q1) on another point charge (Q2) is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance (r) between them.
83
Define an electric field
Describe an electric field as a region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive test charge would move if placed at that point.
84
Define the electric field at a point
Define the electric field at a point: The electric field at a point is the electrostatic force experienced per unit positive charge placed at that point.

Physics (7 decks)

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