AP Magnetism Quiz

The figure shows a long conducting wire that lies in the plane of the page and carries an electric current I toward the right. At the instant shown, a positive point charge +q is in the plane of the page and moving toward the bottom of the page. What is the direction of the magnetic force on the point charge at that instant?

• into the page

• out of the page

• toward the right

• toward the left

An object with charge -q is in motion near a wire that has a current I to the right. At the instant show 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 the page

• The force is directed toward the bottom of the page.

• The force is directed toward the right.

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

Two light wires are hung vertically. With electrical current in both wires directed upwards...

• the wires will experience a force of attraction

• the wires will experience a force of repulsion

• the force on the right hand wire will cancel the force on the left hand wire

• both wires will experience a torque until they are at right angles to each other

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

• A

• B

• C

• D

An 8 cm wire with a current of 2A is oriented 36° from parallel to a magnetic field with a strength of 6T. What is the force on the wire?

• 0.564 N

• 0.777 N

• 96 N

• 0.960 N

A charged particle, Q, is traveling along a magnetic field, B, with speed v. What is the magnitude of the force the particle experiences?

• qvB

• Zero

• ma

• Fsin(Θ)

Suppose that an electron is traveling due east while in the presence of a magnetic field that is oriented such that it is pointing outward, away from the viewer. In what direction does the magnetic force on this electron point?

• Away from the viewer

• North

• Toward the viewer

• South

Two long parallel wires are a distance 2a apart, as shown. Point P is in the plane of the wires and a distance a from wire X. When there is a current I in wire X and no current in wire Y, the magnitude of the magnetic field at P is Bo. When there are equal currents I in the same direction in both wires, the magnitude of the magnetic field at P is

• 2B_o/3

• 10B_o/9

• 4B_o/3

• 2B_o

Two parallel wires, each carrying a current I, repel each other with a force F. If both currents are doubled, the force of repulsion is

• 2√2F

• 4√2F

• 4F

• 8F

A proton is moving at 4.4x105 m/s in a plan of the page when it enters a magnetic field of magnitude 0.04T perpendicular to the page, as show in the figure. The radius of curvature of the path of the proton as it moves through the magnetic field is approximately which of the following?

• 1x10⁴m

• 1x10¹m

• 1x10^-4m

• 1x10^-1m