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A solenoid of length 50 cm with 600 turns is connected to a cell and current through the solenoid is 20πA. Assuming solenoid to be ideal, magnetic field inside the solenoid (in central region) is found to be N×104 T then the value of N is 


Solution

B=μoni
n=Nl=6000.5=1200
i=20π
B=4π×107×1200×20π
=96×104 T

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