A rod PQ of resistance R lies across frictionless conducting rails in a constant uniform…
Physics · Class 12 · CBSE — Electromagnetic Induction
A rod PQ of resistance R lies across frictionless conducting rails in a constant uniform magnetic field \(\vec{{B}}\) , as shown in the figure. Assuming that the rails have negligible resistance, the force required to pull the rod to the right at constant velocity \(\vec{{v}}\) is:
- 0
- \({B} / {v}\)
- \(\frac{{B}/{v}}{{R}}\)
- \(\frac{{B}^{2} l^{2} {v}}{{R}}\)
Answer
(D) B ^ 2 l^ 2 v R
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