Figure shows a conducting rod of negligible resistance that can slide on a smooth U-shaped rail m...

Figure shows a conducting rod of negligible resistance that can slide on a smooth U-shaped rail made of wire of resistance 1 Ωm^-1. Position of the conducting rod at t=0 is shown. A timedependent magnetic field B=2 T (tesla) is switched on at t=0.
Following situation of the previous question, the magnitude of the force required to move the conducting rod at a constant speed of 5  cm s^-1 at the same instant t=2  s is equal to
(1) 0.16  N
(2) 0.12  N
(3) 0.08  N
(4) 0.06  N

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