AP Physics C E&M Review

A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense.

For points OUTSIDE the loop, the magnetic field caused by this current

• circles the loop in a clockwise direction.

• circles the loop in a counterclockwise direction.

• points straight up.

• points straight down.

• is zero.

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NGSS.HS-PS2-5

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A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense.

For points INSIDE the loop, the magnetic field caused by this current

• circles the loop in a clockwise direction.

• circles the loop in a counterclockwise direction.

• points straight up.

• points straight down.

• is zero.

Tags

NGSS.HS-PS2-5

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points

• vertically upward.

• directly toward you.

• to the right.

• to the left.

• directly away from you.

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An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the

• +z-axis.

• -z-axis.

• -x-axis.

• +y-axis.

• -y-axis.

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Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. The electric charge of each of the three particles is, respectively,

• 1 is neutral, 2 is negative, and 3 is positive.

• 1 is neutral, 2 is positive, and 3 is negative.

• 1 is positive, 2 is neutral, and 3 is negative.

• 1 is positive, 2 is negative, and 3 is neutral.

• 1 is negative, 2 is neutral, and 3 is positive.

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A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of radius R. If the accelerating potential is tripled to 3V, what will be the radius of the circular arc?

• 9R

• 3R

• √3 R

• R / √3

• R / 9

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NGSS.HS-PS2-4

NGSS.HS-PS2-5

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

• 4R

• 3R

• √2 R

• R / √2

• R / 2

A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f, the frequency of revolution of the second particle is

• f

• 2f

• 4f

• f / 2

• f / 4

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NGSS.HS-PS3-5

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires

• points upward.

• points downward.

• points toward you.

• points away from you

• is zero.

Tags

NGSS.HS-PS2-5

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The figure shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions. Which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

• A

• B

• C

• D

• E

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