NEET 2023 Phase 1 · PhysicsDipole torquePrevious Year Question
An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 10⁵ N/C. It experiences a torque equal to 4 N·m. The charge on the dipole, if the dipole length is 2 cm, is
Answer: (B) 2 mC. Answer: (b) Solution: Torque on a dipole: τ = pE sin θ = q·l·E·sin θ Solve for q: q = τ / (l·E·sin θ) q = 4 / (2 × 10⁻² × 2 × 10⁵ × sin 30°) q = 4 / (2 × 10⁻² × 2 × 10⁵ × 0.5) q = 4 / (2000) q = 2 × 10⁻³ C = 2 mC.
- A.8 mC
- B.2 mC✓
- C.5 mC
- D.7 μC
Correct Answer
(B) 2 mC
Solution & Explanation
Answer: (b) Solution: Torque on a dipole: τ = pE sin θ = q·l·E·sin θ Solve for q: q = τ / (l·E·sin θ) q = 4 / (2 × 10⁻² × 2 × 10⁵ × sin 30°) q = 4 / (2 × 10⁻² × 2 × 10⁵ × 0.5) q = 4 / (2000) q = 2 × 10⁻³ C = 2 mC.
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