Q7 An air cored solenoid with length 30 cm area of cross section 25 cm...
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Q7 An air cored solenoid with length 30 cm area of cross section 25 cm and number of turns 500 carries a current of 2 5 A The current is suddenly switched off in a brief time of 10 3 s How much is the average back emf induced across the ends of the open switch in the circuit
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