A short bar magnet of magnetic moment 0.5J/T is placed with its axis i

1.	A short bar magnet of magnetic moment 0.5J/T is placed with its axis is 30° to a uniform magnetic of 0.1T. Calculate (i) the magnitude of the torque experienced and (ii) the direction on which it acts
Answer» (i) We know τ = MBsinθ where τ = Torque acting on a short bar magnet M = Magnetic moment B = Magnetic field τ = 0.5 × 0.1 × sin30° = 0.5 × 0.1 × 1/2 = 2.5 × 10^–2Nm (ii) The direction of torque is always perpendicular to the plane containing magnetic moment and magnetic field (vector M x vector B).

A short bar magnet of magnetic moment 0.5J/T is placed with its axis is 30° to a uniform magnetic of 0.1T. Calculate (i) the magnitude of the torque experienced and (ii) the direction on which it acts

Answer»

(i) We know τ = MBsinθ
where τ = Torque acting on a short bar magnet
M = Magnetic moment
B = Magnetic field
τ = 0.5 × 0.1 × sin30°

= 0.5 × 0.1 × 1/2 = 2.5 × 10^–2Nm
(ii) The direction of torque is always perpendicular to the plane containing magnetic moment and magnetic field (vector M x vector B).

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A short bar magnet of magnetic moment 0.5J/T is placed with its axis is 30° to a uniform magnetic of 0.1T. Calculate (i) the magnitude of the torque experienced and (ii) the direction on which it acts

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