First slide

Magnetic dipole in a uniform magnetic field

Question

A magnet of dipole moment 2 Am² is deflected through 30^o from magnetic meridian. The required deflecting torque is (B_H = 0.4 x 10^-4 T)

Easy

A

0.4 x 10^-4 T
B

0.4 Nm
C

0.2 x 10^-4 T
D

none of these

Solution

$ρ = {MB}_{H} \sin θ = 2 \times (0 \cdot 4 \times 10^{- 4}) \sin 30^{\circ} = 0 \cdot 4 \times 10^{- 4} Nm$

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