Moving Charges and Magnetism

Question: The magnetic field at the centre of coil of n turns, bent in the form of a square of side $2l$ ,carrying current $i$, is

1) $\frac{{\sqrt 2 {\mu _0}nI}}{{\pi l}}$

2) $\frac{{\sqrt 2 {\mu _0}nI}}{{2\pi l}}$

3) $\frac{{\sqrt 2 {\mu _0}nI}}{{4\pi l}}$

4) $\frac{{2{\mu _0}nI}}{{\pi l}}$

Solution:

Explanation: No Explanation

Biot-Savart's Law Amperes Law

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