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  4. The magnetic field B at a point on one end of a solenoid having n turns per metre length and carrying a current of i ampere is given by

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Q. The magnetic field $B$ at a point on one end of a solenoid having $n$ turns per metre length and carrying a current of $i$ ampere is given by

Moving Charges and Magnetism

Solution:

Magnetic field at a point on one end of a solenoid $B$
$=\frac{1}{2} \mu_0 n i$