Q. A metallic rods completes its circuit as shown in the figure. The circuit is normal to a magnetic field of B = 0.15 T. If the resistance of the circuit is 3 ohm the force required to move the rod with a constant velocity of 2m/sec. is: 
(1) 3.75 X  ${10}^{-3}$ N 
(2) 3.75 x ${10}^2$ N 
(3) 3.75 x ${10}^{-2}$ N 
(4) 3.75 x ${10}^{-4}$ N