A long solenoid carrying a current produ...

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

`B/2`

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The correct Answer is:

`B = mu_0 n I and B. = mu_0 n. I. = mu_0 (n/2) (2I) = mu_0 n I = B`

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