Question: Q. 9. An electric dipole of dipole moment $\vec{p}$ is placed in a uniform electric field $\vec{E}$. Obtain the expression for the torque $\vec{\tau}$ experienced by the dipole. Identify two pairs of perpendicular vectors in the expression. U [Comptt. Delhi I, II, III, 2015]
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Solution:
Ans. (i) Expression for torque experienced by dipole 2
(ii) Identifying pairs of perpendicular vectors in expression
[CBSE Marking Scheme, 2015]
Detailed Answer :
(i) Try yourself, Similar to Q. 2(i) Short Answer Type Questions-II (ii) From an expression $\vec{\tau}=\vec{p} \times \vec{E}$ two pairs of perpendicular vectors in expression are given as :
(i) $\vec{\tau}$ is perpendicular to $\vec{p}$. $1 / 2$
(ii) $\vec{\tau}$ is perpendicular to $\vec{E}$.
$1 / 2$
