Figure shows a conducting rod of negligible resistance that can sli...

Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance \( 1 \Omega / \mathrm{m} \). Position of the conducting rod at \( \mathrm{t}= \) 0 is shown. A time \( t \) dependent magnetic field \( B=2 t \) Tesla is switched on \( \mathrm{at} \mathrm{t}=0 \).

Following situation of the previous question, the magnitude of the force required to move the conducting rod at constant speed \( 5 \mathrm{~cm} / \mathrm{s} \) at the same instant \( \mathrm{t}=2 \mathrm{~s} \),
is equal to (A) \( 0.16 \mathrm{~N} \)
(B) \( 0.12 \mathrm{~N} \)
(C) \( 0.08 \mathrm{~N} \)
(D) \( 0.06 \mathrm{~N} \)
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