$$\vec{F} = q\vec{v} \times \vec{B}$$

$$\mu_0$ = 4\pi \times 10$$^{-7}$$ \ \mathrm{T \cdot m/A}$$

Question 1

Which of the following statements best describes the source of a magnetic field?

Accepted Answer

A moving electric charge.

Question 2

What is the SI unit for the strength of the magnetic field?

Accepted Answer

tesla

Question 3

If a charged particle moves perpendicular to a uniform magnetic field, what is the shape of its trajectory?

Accepted Answer

Circle

Question 4

Which law gives the magnetic field produced by a moving point charge?

Accepted Answer

Biot-Savart law

Question 5

What is the direction of the magnetic field around a long, straight current-carrying wire?

Accepted Answer

Around the wire

Question 6

If the north pole of one magnet is brought near the north pole of another magnet, what will happen?

Accepted Answer

They will repel each other.

Question 7

What happens when a bar magnet is cut in half?

Accepted Answer

You get two magnets, each with a north and south pole.

Question 8

Which material is most likely to be attracted to a magnet?

Accepted Answer

Iron

Question 9

The earth’s geographic north pole is actually which type of magnetic pole?

Accepted Answer

South magnetic pole

Question 10

Which of the following is NOT a practical application of magnetism?

Accepted Answer

Solar panels

Question 11

A current-carrying wire produces a magnetic field. What rule helps you determine the direction of this field?

Accepted Answer

Right-hand rule

Question 12

If a compass is placed near a current-carrying wire, how will the compass needle align?

Accepted Answer

It will be tangent to a circle around the wire.

Question 13

Which of the following best describes magnetic field lines?

Accepted Answer

They are imaginary lines indicating the direction and strength of the magnetic field.

Question 14

A charged particle moves with velocity $$\vec{v} in a $$magnetic field $$\vec{B}. $$The force on the particle is given by:

Accepted Answer

$$\vec{F} = q\vec{v} 	imes \vec{B}$$

Question 15

What is the permeability constant $$\mu_0$ in SI units?

Accepted Answer

$$\mu_0$ = 4\pi 	imes 10$$^{-7}$$ \ \mathrm{T \cdot m/A}$$

Question 16

Which of the following is true about magnetic poles?

Accepted Answer

All magnets have two poles: north and south.

Question 17

A steel ball is hanging near the north pole of a bar magnet. If the magnet is flipped and the south pole is brought near the ball, what happens?

Accepted Answer

The ball is attracted to the magnet.

Question 18

Which of the following is NOT a property of magnetic materials?

Accepted Answer

They are always made of iron.

Question 19

Which experiment demonstrates that the earth itself acts as a giant magnet?

Accepted Answer

A bar magnet floating on water aligns north-south.

Question 20

What is the main difference between electricity and magnetism according to the experiments?

Accepted Answer

Magnetism is not the same as electricity.

Magnetism and Magnetic Fields: Fundamentals and Applications

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