True or False 1.) (a) A changing magnetic field can induce an emf (an emf is lik

Question

True or False

1.)

(a) A changing magnetic field can induce an emf (an emf is like a battery voltage which can power a circuit).

(b) An emf (and therefore a current as well) can be induced in various process that involve a change in a magnetic flux.

(c) When a magnetic bar is moving toward a loop of wire, current will be induced in the wire.

(d) When a magnetic bar is inside a loop of wire without motion, current will be induced in the wire.

(e) When a magnetic bar is leaving a loop of wire, no current will be induced in the wire.

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Explanation / Answer

a. True

b. True

c. True
As bar moves in the loop, magnetic field will change hence the flux will change. Therefore an emf will be induced.

d. False
As the bar is stationary. There is no change in flux. Hence there will be no current.

e. False
As bar moves out of the loop, magnetic field will change hence the flux will change. Therefore an emf will be induced.

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