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  4. A solenoid of length l and having n turns carries a current i in anticlockwise direction. The magnetic field is

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Q. A solenoid of length $l$ and having $n$ turns carries a current $i$ in anticlockwise direction. The magnetic field is

UPSEEUPSEE 2011

Solution:

A solenoid of length $l$ and having $n$ turns carries a current $i$ in anticlockwise direction. The magnetic field is $\frac{\mu_{0} n i}{l}$. Its direction will be along the axis of solenoid and perpendicular to the axis of coil.