Question: Q. 5. An electric dipole of length 4 cm, when placed with its axis making an angle of 60 with a uniform electric field, experiences a torque of 43Nm. Calculate the potential energy of the dipole, if it has charge ±8nC.

A [Delhi I, II, III 2014]

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Solution:

Ans. Torque

τ=pEsinθ 43=pEsin60=pE32 43=pE32

Hence,

Potential energy,

pE=8

 or U=8×cos60=4 J

[CBSE Marking Scheme, 2014]



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