help me how to solve this problem ??(e.m.f) A rectangular loop with sides of length a= 1.80 cm and b= 2.10 cm is placed near a wire that carries a current that varies as a function of time: it=2.92 + 1.19t2 where the current is in Amperes and the time is in seconds. The distance from the straight wire to the closest side of the loop is d= 0.290 cm. the figure is here : http://img171.imageshack.us/img171/5849/prob09awloop2aa6.gif 1) What is the magnetic flux through the loop at time t= 2.50 seconds? (Define positive flux into the page.) my answer is : (mu0*I/2*pi)*b*ln[(d+a)/d] =8.59×10-8 T*m^2 2) What is the induced e.m.f. in the loop at time t= 2.50 seconds? (Note that positive emf is clockwise. Compute the rate of change of magnetic flux through the loop to get the e.m.f.. ) help me how to solve this problem ??