Question: A long solenoid carrying a current produces a magnetic field B along its axis. If the current is double and the number of turns

A long solenoid carrying a current produces a magnetic field B along

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is double and the number of turns per cm is halved, the new value of the magnetic field is (a) 4B (b) B/2 (c) B (d) 2B

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