Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Magnetism/
Question 20203
JEE Physics · Medium

Magnetism: Torque on Loop — Calculation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Torque on Loop — CalculationMediumQuestion 20203

Question

A rectangular coil 4 cm × 6 cm, 50 turns, carries 2 A in field B = 0.5 T. The plane of the coil is parallel to B. Maximum torque is:
  1. A
    0.12 N·m
    Correct
  2. B
    0.06 N·m
  3. C
    1.2 N·m
  4. D
    0.024 N·m

Correct answer

0.12 N·m

Explanation

τ = NIAB sinθ. Plane parallel to B means normal is perpendicular to B → sinθ = 1. τ = 50 × 2 × (0.04×0.06) × 0.5 = 50 × 2 × 0.0024 × 0.5 = 0.12 N·m.

Review Magnetism notesStart timed chapter practice