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A rod PQ of length 20 cm and mass 200g suspended througha fixed point o by two threads of length20cm each A magnetic field of strength 0.500T exists in the vicinity of the wires PQ as shown in fig , 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 2A is established when the switch S is closed .Find the tension in the threads now ( see fig below )???????? explain stepwise aswer???


 A rod PQ of length 20 cm and mass 200g suspended througha fixed point o by two threads of length20cm each A magnetic field of strength 0.500T exists in the vicinity of the wires PQ as shown in fig , 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 2A is established when the switch S is closed .Find the tension in the threads now  ( see fig below )????????  explain stepwise aswer???


Grade:10

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