First slide

Magnetic dipole in a uniform magnetic field

Question

The restoring torque for a magnet oscillating in the vibration magnetometer is provided by

Easy

A

Torsion in the suspension thread
B

Gravity
C

Horizontal component of the earth’s magnetic field
D

By all these

Solution

$τ = (m B_{H}) 2 l \sin θ τ$
$= (m .2 l) B_{H} \sin θ$
$\Rightarrow τ = μ B_{H} s i n θ$

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