Q.

A square loop of area 2.5×103m2 and having 100 turns with a total resistance of 100Ω is moved out of a uniform magnetic field of 0.40 T in 1 sec with a constant speed. Then work done, in pulling the loop is

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a

1 mJ

b

1μJ

c

zero

d

0.1 mJ

answer is D.

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Detailed Solution

e=dϕdt=BANt;w=e2R,t

w=B2A2N2Rt2×t

w=B2A2N2Rt

w=(0.40)2×(25×104)2×(100)2100×1=0.1mJ

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