Question

A square loop of side 15 cm being moved towards right at a constant speed of 2 cm/s as shown in figure. The front edge enters the 50 cm wide magnetic field at t = 0. The value of induced emf in the loop at t = 10 s will be : 

 

(1) 0.3 mV 

(2) 4.5 mV 

(3) zero 

(4) 3 mV 

Answer 1

Correct option is : (3) zero 

 At t = 10 sec complete loop is in magnetic field therefore no change in flux

 

\(\mathrm{e}=\frac{\mathrm{d} \phi}{\mathrm{dt}}=0\)  

e = 0 for complete loop