AIPMT PRELIMS2012Physics-Electric Charges and Fields
AIPMT PRELIMS 2012 Physics Electric Dipole MCQ Question
Type: MCQ-conceptual-Medium-Class 12
An electric dipole of moment ‘p’ is placed in an electric field of intensity ‘E’. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when θ = 90°, the torque and the potential energy of the dipole will respectively be
A
pE cosθ, −pE sinθ
B
pE sinθ, −pE cosθ
C
pE sinθ, −2pE cosθ
D
pEsinθ, 2pEcosθ
Correct Answer
Option B
Detailed Explanation
The torque on the dipole is given by τ = pE sinθ, and the potential energy is U = −pE cosθ. These expressions are derived from the basic definitions of torque and potential energy in an electric field.
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