A square coil (0.40 m2) of wire consists of 70 loops. The magnetic field is perpendicular
to the face of the coil and decreases at a rate of 0.025 T/s. What is the magnitude of
the induced electromotive force in the loop?
ε=nSB˙=0.7 V.\varepsilon=nS\dot B=0.7~V.ε=nSB˙=0.7 V.
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