Moving Charges and Magnetism

Question: In the figure shown there are two semicircles of radii ${r_1}$ and ${r_2}$ in which a current i is flowing. The magnetic induction at the centre O will be

1) $\frac{{{\mu _0}i}}{r}({r_1} + {r_2})$

2) $\frac{{{\mu _0}i}}{4}({r_1} - {r_2})$

3) $\frac{{{\mu _0}i}}{4}\left( {\frac{{{r_1} + {r_2}}}{{{r_1}{r_2}}}} \right)$

4) $\frac{{{\mu _0}i}}{4}\left( {\frac{{{r_2} - {r_1}}}{{{r_1}{r_2}}}} \right)$

Solution:

Explanation: No Explanation

Biot-Savart's Law Amperes Law

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