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Question

Figure shows a rod PQ of length 20 cm and mass 200 g suspended through a fixed point O by two threads of length 20 cm each. A magnetic field of strength 0.5 T exists in the vicinity of the wire PQ as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. A current of 2 A is established when the switch S is closed. The tension in the threads is


A

1.25 N

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B

2. 25 N

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C

3. 25 N

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D

4. 25 N

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Solution

The correct option is A

1.25 N



In equilibrium, 2T cos θ=Mg+Bil2T×cos 30=0.2×9.8+0.5×2×0.2T=1.25 N


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