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A tightly-wound, long solenoid carries a current of 2.00A.

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A tightly-wound, long solenoid carries a current of 2.00A. An electron is found to execute a uniform circular motion inside the solenoid with a frequency of 1.00 x 108rev/s. Find the number of turns per metre in the solenoid.

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i = 2a, f = 108rev/sec, n= ?, me = 9.1 × 10–31kg,

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