A bar magnet of length $14 \,cm$ is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of $18\, cm$ from the center of the magnet. If $B _{ H }=0.4 \,G ,$ the magnetic moment of the magnet is $\left(1\, G =10^{-4} T \right)$
A bar magnet of length $14 \,cm$ is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of $18\, cm$ from the center of the magnet. If $B _{ H }=0.4 \,G ,$ the magnetic moment of the magnet is $\left(1\, G =10^{-4} T \right)$
- [JEE MAIN 2021]
- A
$2.880 \times 10^{3}\, J \,T ^{-1}$
- B
$2.880 \times 10^{2}\, J\, T ^{-1}$
- C
$2.880\, J\, T ^{-1}$
- D
$28.80\, J\, T ^{-1}$
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