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A square wire loop with 2.00 m sides is perpendicular to a uniform magnetic field, with half the area of the
loop in the field as shown in the figure. The loop contains an ideal battery with emf e = 20 V
If the magnitude of the field varies with time according to B =
0.042t + 0.87t with B in teslas and t in seconds, what are
(a) the net emf in the circuit and
(b) the direction of the (net) current around the loop?
hat

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