Question 1

Which of the following best describes the pattern of the magnetic field lines around a bar magnet, as shown in the first image?

Accepted Answer

The field lines emerge from the north pole and enter the south pole, forming closed loops.

Question 2

The Earth's geographic north pole corresponds to which magnetic pole of the Earth, as shown in the second image?

Accepted Answer

Magnetic south pole

Question 3

A positive charge $$q$$ moves to the right in a uniform magnetic field directed into the page (see image 3). What is the direction of the magnetic force on the charge?

Accepted Answer

Upward

Question 4

A particle moves in the $$xy-$$plane as shown in image 4. What is the direction of the magnetic force acting on the particle if the magnetic field is in the $$+z$$ direction (out of the page)?

Accepted Answer

$$+z$$\ (	ext{out of page})$

Question 5

Two particles enter a region with a uniform magnetic field (image 5). Particle $$a$$ curves more sharply than particle $$b. $$What can you conclude about their charges if their velocities are equal?

Accepted Answer

Particle $$a$$ has a larger charge magnitude than particle $$b$$

Question 6

In the velocity selector shown in image 6, what is the required direction of the magnetic field $$\vec{B} so $$that electrons moving to the right pass through undeflected if the electric field $$\vec{E}$$ points upward?

Accepted Answer

Into the page

Question 7

A vertical wire carries a current upward in a region where the magnetic field points to the right (image 7). What is the direction of the force on the wire?

Accepted Answer

Into the page

Question 8

A horizontal wire carries a current to the right in a region where the magnetic field points upward (image 8). What is the direction of the force on the wire?

Accepted Answer

Out of the page

Question 9

A rectangular loop of wire with width $$w$$ and height $$h$$ carries a current $$I in a $$uniform magnetic field $$\vec{B} as $$shown in image 9. What is the net force on the loop?

Accepted Answer

$$0$$

Question 10

A coil is placed between the poles of a magnet as shown in image 10. What physical principle allows the coil to rotate and move the pointer on the scale?

Accepted Answer

Torque due to the interaction of the current and the magnetic field

Question 11

If there is a current in the loop in the direction shown in image 12, what will the loop do?

Accepted Answer

Rotate clockwise

Question 12

Two long, straight wires carry currents $$I_1 = 3.0$$\ \mathrm{A}$$ (into the page) and I_2$ = 4.0\ \mathrm{A} ($$out of the page), separated by $$5.0\ \mathrm{cm} as $$shown in image 13. What is the direction of the net magnetic field at point $$P$$?

Accepted Answer

Upward

Question 13

Two parallel wires carry currents in the same direction as shown in image 14. What is the direction of the force on the lower wire due to the upper wire?

Accepted Answer

Upward (attractive)

Question 14

At point $$P in $$image 15, what is the direction of the net magnetic field due to the two wires?

Accepted Answer

Direction 3

Question 15

A positive charge $$+q$$ moves upward in the $$y-$$direction near a current-carrying wire as shown in image 16. What is the direction of the magnetic force on the charge?

Accepted Answer

$$-z ($$into the page)

Question 16

Which of the following statements is true about the magnetic field inside a solenoid, as shown in image 18?

Accepted Answer

The field is strong and uniform inside the solenoid.

Question 17

A square loop carries a current $$I as $$shown in image 19. What is the direction of the magnetic field at point $$P at $$the center of the loop?

Accepted Answer

Out of the page

Magnetic Fields and Forces: Step-by-Step Physics Guidance

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