Electric & Magnetic Fields (7)

Question 1

what is an electric field

Answer 1

a region where a charged particle experiences a force

Question 2

Do all charged particles create their own electric fields?

Answer 2

yes

Question 3

How does a repulsive force change with distance?

Answer 3

It decreases as distance increases.

Question 4

What type of force do electric fields exert?

Answer 4

Electrostatic force.

Question 5

What is the formula for electric field strength?

Answer 5

E = F/Q
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Question 6

What does the direction of electric field lines indicate?

Answer 6

Away from a positive charge, toward a negative charge.

Question 7

What is the unit of electric field strength?

Answer 7

Newtons per Coulomb (N/C).

Question 8

How do you determine the direction of an electric field?

Answer 8

Use a positive test charge as a reference.

Question 9

What is the formula for electrostatic force?

Answer 9

F=KQ1Q2/r^2

Question 10

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

Answer 10

1/4

Question 11

What does Coulomb’s Law state?

Answer 11

The force between two charges is proportional to their product and inversely proportional to the square of their separation.

Question 12

What does a positive force indicate?

Answer 12

repulsive force between Q1 and Q2

Question 13

What is the formula for the electric field due to a point charge?

Answer 13

E=KQ/r^2

Question 14

How does the electric field strength change with distance?

Answer 14

It follows an inverse square law, decreasing as distance increases.

Question 15

What type of field does a point charge produce?

Answer 15

a radial field

Question 16

How is this equation similar to gravitational field strength?

Answer 16

both follow an inverse square law

Question 17

What is electric potential?

Answer 17

Work done per unit charge in moving a test charge to a point.

Question 18

How does electric potential change with distance?

Answer 18

It decreases with distance for a positive charge and increases for a negative charge.

Question 19

What happens to potential energy when a charge moves against an electric field?

Answer 19

It increases.

Question 20

What does a steeper potential gradient mean?

Answer 20

A stronger electric field.

Question 21

What is the formula for electric field strength between parallel plates?

Answer 21

E=V/D

Question 22

what type of field can this be used in

Answer 22

only uniform

Question 23

What is the direction of the electric field between plates?

Answer 23

From the positively charged plate to the negatively charged plate.

Question 24

What happens to a charge in a uniform field?

Answer 24

It experiences a constant force.

Question 25

What is the equation for electric potential in a radial field due to a point charge?

Answer 25

V=KQ/r

Question 26

How is electric potential different from electric field strength?

Answer 26

Potential varies as 1/r, while field strength varies as 1/r^2

Question 27

What is the potential at infinity?

Answer 27

zero

Question 28

The electric potential at a point is defined as:

Answer 28

The work done per unit charge in bringing a positive test charge from infinity to that point

Question 29

How are electric field lines drawn?

Answer 29

Away from positive charges, towards negative charges.

Question 30

What do closer field lines indicate?

Answer 30

A stronger electric field.

Question 31

What happens at a neutral point between two like charges?

Answer 31

The electric field strength is zero.

Question 32

How do field lines behave in a uniform field?

Answer 32

They are parallel and equally spaced.