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NCERT Class XII Chapter
Electric Charges and Fields
Questions With Solutions

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Question : 10
Total: 34
An electric dipole with dipole moment 4 × 10–9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 104 N C–1.
Calculate the magnitude of the torque acting on the dipole.
Solution:  
Torque on dipole is, τ = pE sin 30°
or τ = 4 × 10−9 × 5 × 104×
1
2
 or τ = 10 × 10−5 or τ = 1 × 10−4 N m
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