A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained $20\, cm $ away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point be $0.3$ $gauss$, the magnetic moment of the magnet is
A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained $20\, cm $ away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point be $0.3$ $gauss$, the magnetic moment of the magnet is
- A
$8.0 \times {10^2}\,e.m.u.$
- B
$1.2 \times {10^3}\,e.m.u.$
- C
$2.4 \times {10^3}\,e.m.u.$
- D
$3.6 \times {10^3}\,e.m.u.$
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- [JEE MAIN 2021]
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