electric-charges-and-fields Question 14

Question: Q. 4. An electric dipole is placed in a uniform electric

field E with its dipole moment p parallel to the field. Find

(i) the work done in turning the dipole till its dipole moment points in the direction opposite to E.

(ii) the orientation of the dipole for which the torque acting on it becomes maximum.

A [Comptt. O.D. I, II, III 2014]

Show Answer

Solution:

Ans. (i) We have W=θ1θ2τdθ

W=0πpEsinθdθ

W=pE[cosθ]0π

W=2pE

τ=pEsinθ

(ii) For θ=π2,τ is maximum.

[CBSE Marking Scheme, 2014]



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