A square loop of area 2.5 × 10-3 m² and having 100 turns with a total resistance of 100Ω is moved out of a uniform magnetic field…..

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Q. A square loop of area 2.5 × 10-3 m² and having 100 turns with a total resistance of 100Ω is moved out of a uniform magnetic field of 0.40 T in 1s with a constant speed. Then the work done in pulling the loop is

Current Electricity

(a) 0

(b) 1 mJ

(c) 1 μJ

(d) 0.1 mJ

Ans: (d)

Sol: $ \displaystyle e = \frac{NBA}{t}$

$ \displaystyle W = \frac{e^2}{R} t $

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