AP Physics C Magnetism

The diagram shows an electron current in a wire loop. What is the direction of the magnetic field at the center of the loop?

• into this screen

• out of this screen

• clockwise

• counterclockwise

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The diagram shows a conductor carrying a current in which the electron flow is from left to right. The conductor is located in a magnetic field which is directed into this screen. The direction of the magnetic force on the conductor will be

• into this screen

• out of this screen

• toward the top of this screen

• toward the bottom to this screen

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Each of the figures shows the path of a charged particle moving in the plane of the screen in a magnetic field that is perpendicular to the screen. If mass, speed and charge are the same, in which case does the field have the greatest magnitude?

• 
• 
• 
• 

An object with charge -q is in motion near a wire that has a current I to the right. At the instant shown in the figure, the object is traveling to the right with speed v. Both the wire and the motion of the object are in the plane of the page. Which of the following statements is true about the force on the object due to the current I at the instant shown?

• The force is directed toward the top of this screen.

• The force is directed toward the bottom of this screen.

• The force is directed toward the right.

• There is no force on the object due to the current.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The gray rectangle in the figure represents a region of uniform magnetic field directed out of the screen. A square loop of wire of side s is in the plane of the screen and is pulled at constant speed v through the field. Which of the following could show the current I in the loop as a function of the position of the right edge of the loop?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Four infinitely long wires are arranged as shown in the accompanying figure end-on-view. All four wires are perpendicular to the plane of the screen and have the same magnitude of current I. The conventional current in the wire in the upper right hand corner is directed into the plane of the screen. The other conventional currents are out of the plane of the screen. Point P is a distance a from all four wires. What is the total magnetic field at point P?

• 
• 
• 
• zero

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A loop of wire is connected to an ammeter, as shown, and held in place. The ammeter has a scale with zero in the middle and a needle that moves away from zero in either direction to measure the magnitude and direction of any current in the loop. A bar magnet is held above the center of the loop and released from rest. Which of the following best describes the action of the ammeter needle as the magnet falls through the loop?

• The ammeter needle remains at zero.

• The ammeter needle deflects in one direction as the magnet approaches, passes through, and moves away from the loop.

• The ammeter needle deflects in one direction as the north end of the magnet approaches the loop, returns to zero when the center of the magnet is in the loop, and deflects in the same direction when the south end of the magnet is moving away from the loop.

• The ammeter needle deflects in one direction as the north end of the magnet approaches the loop, returns to zero when the center of the magnet is in the loop, and deflects in the other direction when the south end of the magnet is moving away from the loop.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The diagram shows a coil of wire connected to a battery. The N-pole of this coil is closest to

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

The field around a permanent magnet is caused by the motions of

• electrons

• protons

• nucleons

• neutrons

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A charged particle moves in a circular path in a uniform magnetic field. If the radius of the path is halved, what happens to the magnetic force on the particle?

• It doubles

• It halves

• It remains the same

• It quadruples

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5