Question 1

A proton moves with velocity $$\vec{v}$$ perpendicular to a uniform magnetic field $$\vec{B}. $$Which of the following correctly describes the direction of the magnetic force acting on the proton?

Accepted Answer

The force is perpendicular to both $$\vec{v}$$ and $$\vec{B}.$$

Question 2

Which equation correctly gives the magnitude of the magnetic force on a particle of charge $$q$$ moving with velocity $$\vec{v} in a $$magnetic field $$\vec{B}$$?

Accepted Answer

$$F = qvB \sin	heta$$

Question 3

A wire carries a current $$I to $$the right in a region where the magnetic field points out of the page. What is the direction of the force on the wire?

Accepted Answer

Upward

Question 4

Which of the following best describes the shape of magnetic field lines around a straight, current-carrying wire?

Accepted Answer

Concentric circles centered on the wire

Question 5

A charged particle enters a region of uniform magnetic field at an angle of $$30^\circ to $$the field direction. What is the resulting path of the particle?

Accepted Answer

A helix

Question 6

Which rule is used to determine the direction of the force on a positive charge moving in a magnetic field?

Accepted Answer

Right-hand rule

Question 7

If the velocity of a charged particle is parallel to the magnetic field, what is the magnetic force acting on it?

Accepted Answer

$$F = 0$$

Question 8

A particle with charge $$-q$$ moves to the north in a region where the magnetic field points upward. What is the direction of the magnetic force on the particle?

Accepted Answer

To the east

Question 9

Which of the following is true about the magnetic force on a stationary charge in a magnetic field?

Accepted Answer

The force is zero.

Question 10

A proton and an electron move with the same velocity perpendicular to a uniform magnetic field. How do the directions of their magnetic forces compare?

Accepted Answer

They are opposite to each other.

Question 11

A rectangular loop of wire carries a current $$I$$ and is placed in a uniform magnetic field $$\vec{B}$$ perpendicular to the plane of the loop. What is the net force on the loop?

Accepted Answer

Zero

Question 12

Which of the following best describes the relationship between electric and magnetic fields?

Accepted Answer

A changing electric field can produce a magnetic field.

Question 13

A charged particle moves in a circle of radius $$r in a $$uniform magnetic field $$B. $$Which equation gives the speed $$v of $$the particle?

Accepted Answer

$$v = \frac{qBr}{m}$$

Question 14

A current-carrying wire is placed in a uniform magnetic field. Which equation gives the force on a length $$L of $$the wire?

Accepted Answer

$$F = ILB \sin	heta$$

Question 15

A positive ion moves eastward and experiences an upward magnetic force. If the magnetic field is horizontal, what is its direction?

Accepted Answer

South

Magnetism: Magnetic Fields and Forces

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