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A long solenoid is formed by winding 20 ...

A long solenoid is formed by winding 20 turns `cm^-1`. What current is necessary to produce a magnetic field of 20 mT inside the solenoid?

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Solution: The magnetic field inside the solenoid is
` B = (mu_0) ni`
` or, 20 xx 10^-3 T = (4 pi xx (10^-7) TmA^-1) xx (20 xx ((10^2)m^-1) i`
` or, i=8*0A.`
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HC VERMA-MAGNETIC FIELD DUE TO CURRENT-exercise
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  15. Consider a straight piece of length x of a wire carrying a current i. ...

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  16. Consider a 10-cm long piece of a wire which carries a current of 10A ....

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