2 S A conducting circular loop of face area 2:5 10 m is placed perpendicular to a magnetic field which varies as B = (0.20 T) sin[(50r s)t]. (a) Find the charge flowing through any cross-section during the time t=0 to t = 40 ms. (b) If the resistance of the loop is 10 , find the thermal energy developed in the loop in this period.