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Mastery Quiz
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1

With magnets
A)like poles repel one another
B)like poles attract one another
C)unlike poles repel one another
2

The force between two unlike magnetic poles
A)increases linearly with the separation distance between them
B)increases as the square of the separation distance between them
C)decreases as the separation distance between them
D)decreases as the square of the separation distance between them
3

A magnet on a frictionless mount would have its magnetic north pole point toward the Earth's geographic
A)south pole
B)north pole
4

The magnetic field lines of a bar magnet
A)begin on a north pole and end on a north pole
B)begin on a south pole and end on a south pole
C)begin on a north pole and end on a south pole
D)begin on a south pole and end on a north pole
5

The magnetic field lines produced by a current in a straight wire
A)are directed outward in a direction perpendicular to the wire
B)are directed in concentric circles around the wire
C)begin on one side of the wire and end on the other side of the wire
6

The magnetic force on a particle with positive charge ,q , moving at speed, v, at right angles to a region of magnetic field strength, B, is given by
A)F = qv/B
B)F = qvB
C)F = vB/q
7

According to Faraday's Law of Electromagnetic Induction, the induced voltage is equal to
A)the rate of change of the magnetic flux
B)the rate of change of the magnetic field strength
C)the rate of change of the magnetic force
D)the rate of change of the loop area
8

In a transformer the equation relating the ratio of the voltage in the secondary to the voltage in the primary and the ratio of the number of turns in the secondary to the number of turns in the primary is
A)ΔV2/ΔV1 = N1/N2
B)ΔV2/ΔV1 = N2/N1
9

If a transformer steps up the voltage it must
A)also step up the current
B)leave the current unchanged
C)step down the current
10

According to Lenz's Law the direction of the induced current produced by a changing magnetic flux is such as to produce a magnetic field that
A)reinforces the change in the original magnetic flux.
B)opposes the change in the original magnetic flux.





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