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 c m is halved, then the new value of the magnetic field is

Question

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 c m is halved, then the new value of the magnetic field is, B, 2 B, 4 B, B / 2

MARKS App · Accepted Answer

Magnetic field on the axis of a solenoid B = μ 0 n i B ′ = μ 0 n 2 2 i = B

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