Two charges of each magnitude 0.01C and separated by a distance of 0.4 mm constitute an electric dipole. If the dipole is placed in an uniform…
JEE Main 2023 — Physics Electromagnetism
2023mcqmedium
Two charges of each magnitude 0.01C and separated by a distance of 0.4mm constitute an electric dipole. If the dipole is placed in an uniform electric field E of 10dyne⋅C−1 making 30∘ angle with E, the magnitude of torque acting on dipole is:
Official previous-year question
Held on 13 Apr 2023 · Verified 6 Jul 2026.
Options
A
4.0×10−10Nm
B
1.0×10−8Nm
C
1.5×10−9Nm
D
2.0×10−10Nm
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Solution
The formula to calculate the dipole moment is given by
∣p⇀∣=q∣d⇀∣...(1)
Substitute the values of the known parameters into equation (1) to calculate the dipole moment.
∣p⇀∣==0.01C×0.4mm×103mm1m4.0×10−6C⋅m
The formula to calculate the torque on the dipole in the electric field is given by
∣τ∣=∣p×E∣...(2)
Substitute the values of the known parameters into equation (2) to calculate the required torque.