1.

The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here A = area of the coil, B = magnetic field)                                                         [MP PET 2002]

A.            \[e=-A.\frac{dB}{dt}\]     
B.            \[e=-B.\frac{dA}{dt}\]
C.            \[e=-\frac{d}{dt}(A.B)\]  
D.            \[e=-\frac{d}{dt}(A\times B)\]
Answer» D.            \[e=-\frac{d}{dt}(A\times B)\]


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