Q.

A conducting rod of mass 200 g and length 10 cm can slide without friction on two long, horizontal rails. A uniform magnetic field of magnitude 5 mT exists in the region asshown. A source S is used to maintain a constant current 2 A through the rod. If motion of the rod starts from the rest, find its speed (in cm/s) after 10 s from the start of the motion.

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answer is 5.

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Detailed Solution

a=ilBm and v=ilBmt=5 cm/s
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