A circular wire loop is in a uniform magnetic field as shown in the fiqure. The

Question

A circular wire loop is in a uniform magnetic field as shown in the fiqure. The field vectors point into the page. The magnetic field is then turned off. Select the correct statement. The induced electromotive force is smaller in magnitude if the magnetic field is turned ofr hejnduced electromotive force is larger in magnitude if the magnetic field is turned off more quickly. The induced electromotive force is larger in magnitude if the magnetic field is turned off more slowly. O The magnitude of the induced electromotive force is always the same no matter how guicky theuche eiechreri otw/d ortrns da rgfer in magnitude if the magnetic field is turned off Thé induced eletromotive force is larger in magnitude if the magnetic field is turned off more quickly. Submit Answer Tries 0/6 Select the correct statement. There is no induced current flowing in the loop. O The induced current first flows counter-clockwise and then clockwise. The induced current flows counter-clockwise. O The induced current flows clockwise. The induced current first flows clockwise and then counter-clockwise. Submit Answer Tries 0/6 Select the correct statement. If the radius of the loop is doubled, then the induced electromotive force doubles. O If the radius of the loop is halved, then the induced electromotive force doubles. O If the radius of the loop is halved, then the induced electromotive force halves. O If the radius of the loop is doubled, then the induced electromotive force halves. O If the radius of the loop is doubled, then the induced electromotive force quadruples. Submit Answer Tries 0/6

Explanation / Answer

induced emf = d(flux)/dt

= B A / t

more quickly -> less t -> larger emf

Ans: induced emf is larger if the magnetic field is turned off more quickly.

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field is into the page. field is switch off means flux will decrease so induced current will like that due to this current field will be into the page. (to cancel the effect)

Ans: induced current flows clockwise.

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e = B pi R^2 / t

R -> 2 R then e - > 2^2 e = 4 e

Ans: if radius is doubled then emf quadruples.

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