NEET2023Physics-Electrostatics
NEET 2023 Physics Electric Dipole MCQ Question
Type: MCQ-numerical-Medium-Class 12
An electric dipole is placed at an angle of 30° with an electric field of intensity 2×10⁵ N C⁻¹. It experiences a torque equal to 4 N m. Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm.
A
6 mC
B
4 mC
C
2 mC
D
8 mC
Correct Answer
Option B
Detailed Explanation
Torque τ = pE sin θ, where p = qd. Given τ = 4 Nm, E = 2×10⁵ N/C, θ = 30°, and d = 0.02 m, we solve for q: q = τ / (E * d * sin θ) = 4 / (2×10⁵ * 0.02 * 0.5) = 4 mC.
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