A magnetic B field of strength 0.1 T is perpendicular to a loop with an area of

Question

A magnetic B field of strength 0.1 T is perpendicular to a loop with an area of 3 m2. If the area of the loop is reduced to zero in 0.7 s, then what is the magnitude of the induced emf voltage?
V

into out of  The original B field penetrating the loop points ________ the page.

increases remains the same decreases  As the loop is pulled as indicated, the magnetic flux penetrating the loop ________.

into out of no induced B field  Therefore, the loop generates an induced B field that points ________ the page.

clockwise counter-clockwise no induced current  This induced B field is due to an induced current that flows ________ in the loop

Explanation / Answer

magnetic field strength B = 0.1 T

Initial Area A= 3 m2.

Final area A ' = 0

Time t = 0.7 s

the magnitude of the induced emf voltage E = B(A-A') / t

= 0.1(3-0) /0.7

= 0.4285 volt

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