Q. A rectangular loop 10 cm and 3 cm moving out of a region of uniform magnetic field of 0.5 T directed normal to the loop. If we want to move loop with a constant velocity 1 cm/sec, then what is the required mechanical force? (Resistance of loop = 1 m ohm)  


(1) 2.25 x ${10}^{-3}$N 
(2) 4.5 x ${10}^{-3}$ N
(3) 9 x ${10}^{-3}$N 
(4) 1.25 x ${10}^{-3}$ N