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 Figure . The loop contains an ideal battery with emf E = 20.0V. If the magnitude of the field varies with time according to B=0.0420â0.870t,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?