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27 shows a rod PQ of length 20 0 cm and mass 200 g suspended...

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27 shows a rod PQ of length 20 0 cm and mass 200 g suspended through a fixed point O by two threads of lengths 20 0 cm each A magnetic field of strength 0 500 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 Find the tension in the threads when the switch S is open b A current of 2 0 A is established when the switch S is closed Find the tension in the threads now PA S

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