Magnetostatic

Question 1

What is magnetostatics?

Answer 1

The study of magnetic fields in systems where the currents are steady (not changing with time).

Question 2

True or False: Magnetostatics deals with time-varying magnetic fields.

Answer 2

False

Question 3

What is the unit of magnetic field strength (H)?

Answer 3

Ampere per meter (A/m)

Question 4

Fill in the blank: The magnetic field (B) is measured in _______.

Answer 4

Tesla (T)

Question 5

What law describes the relationship between electric current and the magnetic field it generates?

Answer 5

Ampère’s Law

Question 6

What is the formula for Ampère’s Law?

Answer 6

∮B·dl = μ₀I_enc

Question 7

True or False: The magnetic field inside a long, straight conductor carrying current is uniform.

Answer 7

False

Question 8

What is the magnetic field inside a long solenoid?

Answer 8

B = μ₀(nI), where n is the number of turns per unit length.

Question 9

Which law states that the magnetic field around a conductor is proportional to the current flowing through it?

Answer 9

Biot-Savart Law

Question 10

What is the formula for the Biot-Savart Law?

Answer 10

dB = (μ₀/4π) * (I * dl × r̂) / r²

Question 11

What does the symbol μ₀ represent?

Answer 11

The permeability of free space.

Question 12

In SI units, what is the value of μ₀?

Answer 12

4π × 10⁻⁷ T·m/A

Question 13

What is the concept of magnetic flux?

Answer 13

The measure of the quantity of magnetism, considering the strength and extent of the magnetic field.

Question 14

Fill in the blank: Magnetic flux (Φ) is measured in _______.

Answer 14

Weber (Wb)

Question 15

What is the formula for magnetic flux?

Answer 15

Φ = B · A · cos(θ)

Question 16

True or False: The direction of the magnetic field is from North to South.

Answer 16

True

Question 17

What is the right-hand rule used for in magnetostatics?

Answer 17

To determine the direction of the magnetic field around a current-carrying conductor.

Question 18

What does the term ‘magnetic dipole’ refer to?

Answer 18

A magnetic source with a north and south pole.

Question 19

What is the magnetic moment (m) of a current loop?

Answer 19

m = I · A, where I is the current and A is the area of the loop.

Question 20

What is the principle of superposition in magnetostatics?

Answer 20

The total magnetic field is the vector sum of the fields produced by individual sources.

Question 21

True or False: Magnetic monopoles exist in nature.

Answer 21

False

Question 22

What is the relationship between electric current and magnetic field direction in a solenoid?

Answer 22

The direction of the magnetic field inside a solenoid is determined by the right-hand rule.

Question 23

What is the significance of the Lorentz force in magnetostatics?

Answer 23

It describes the force experienced by a charged particle moving in a magnetic field.

Question 24

What is the formula for the Lorentz force?

Answer 24

F = q(v × B)

Question 25

What does the term 'ferromagnetism' describe?

Answer 25

The phenomenon where certain materials can become permanently magnetized.

Question 26

What is the difference between diamagnetic and paramagnetic materials?

Answer 26

Diamagnetic materials are repelled by magnetic fields, while paramagnetic materials are attracted.

Question 27

Fill in the blank: The magnetic field outside a long straight wire decreases with distance as _______.

Answer 27

1/r

Question 28

What is the main application of magnetostatics in technology?

Answer 28

Designing magnetic circuits in electrical devices.

Question 29

What is the magnetic field due to a circular loop of wire carrying current at its center?

Answer 29

B = (μ₀I)/(2R), where R is the radius of the loop.

Question 30

True or False: The magnetic field inside a toroid is uniform.

Answer 30

True

Question 31

What is the formula for the magnetic field inside a toroid?

Answer 31

B = (μ₀NI)/(2πr), where N is the number of turns and r is the distance from the center.

Question 32

What is an electromagnet?

Answer 32

A magnet created by electric current flowing through a coil of wire.

Question 33

What is the purpose of a magnetic shield?

Answer 33

To protect sensitive electronic equipment from external magnetic fields.

Question 34

Fill in the blank: The force between two parallel current-carrying wires is _______ to the currents and the distance between them.

Answer 34

Proportional

Question 35

What is meant by 'magnetic hysteresis'?

Answer 35

The lag between the change in magnetization of a material and the change in magnetic field.

Question 36

True or False: Magnetic field lines can cross each other.

Answer 36

False

Question 37

What is the relationship between magnetic field strength (H) and magnetic flux density (B)?

Answer 37

B = μH, where μ is the permeability of the medium.

Question 38

What is the term for the region around a magnet where magnetic forces can be detected?

Answer 38

Magnetic field.

Question 39

What is the effect of temperature on ferromagnetic materials?

Answer 39

Increasing temperature can reduce magnetization, leading to a loss of magnetic properties.

Question 40

What is the principle of magnetic levitation?

Answer 40

Using magnetic forces to lift an object against gravity.

Question 41

Fill in the blank: The magnetic field around a wire is _______ to the direction of current flow.

Answer 41

Perpendicular

Question 42

What is the main difference between AC and DC in terms of magnetostatics?

Answer 42

DC produces a steady magnetic field, while AC produces a time-varying magnetic field.

Question 43

What is the significance of the magnetic permeability of a material?

Answer 43

It determines how easily a material can become magnetized.

Question 44

What is the term used to describe the strength of a material's magnetic field?

Answer 44

Magnetic intensity.

Question 45

What does the term 'flux density' refer to?

Answer 45

The amount of magnetic flux through a unit area.

Question 46

What is the relationship between magnetic field lines and magnetic field strength?

Answer 46

The density of magnetic field lines indicates the strength of the magnetic field.

Question 47

What is the role of magnetic domains in ferromagnetic materials?

Answer 47

They are regions where the magnetic moments of atoms are aligned in the same direction.

Question 48

What is the phenomenon of magnetic saturation?

Answer 48

The point at which an increase in applied magnetic field does not increase magnetization.

Question 49

What is the term for the maximum magnetic field strength a material can achieve?

Answer 49

Saturation magnetization.

Question 50

What is the difference between hard and soft magnetic materials?

Answer 50

Hard magnetic materials retain their magnetization, while soft materials can be easily magnetized and demagnetized.