An Electric Dipole of Moment P is Placed Parallel to the Uniform Electric Field | Bzziii

An electric dipole of moment p is placed parallel to the uniform electric field. The amount of work done in rotating the dipole by 900 is- 

(i) 2pE 

(ii) pE 

(iii) pE/2 

(iv) Zero

(ii) pE 

Explanation:

W = pE (cosθ1 – cosθ2) 

θ1 = 0° 

θ2 = 90° 

W = pE (cos 0° - cos 90°) 

= pE (1 – 0) = pE

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CBSE Class 12 Physics Sample Paper-2022