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JEE Physics · Medium

Magnetism: Torque — Zero Condition MCQ

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Torque — Zero ConditionMediumQuestion 20214

Question

Torque on a current loop in a uniform magnetic field is zero when:
  1. A
    Plane of loop is perpendicular to B
    Correct
  2. B
    Plane of loop is parallel to B
  3. C
    Loop carries maximum current
  4. D
    Loop is circular

Correct answer

Plane of loop is perpendicular to B

Explanation

τ = NIAB sinθ = 0 when θ = 0 or 180°. When the plane is perpendicular to B, the normal is parallel to B → θ = 0 → τ = 0.

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