CBSE 2023 · Region 5 · Set 2 · Q22 · 2 marks
An electric dipole of dipole moment $\displaystyle (\vec{p})$ is kept in a uniform electric field $\displaystyle \vec{E}$. Show graphically the variation of torque acting on the dipole $\displaystyle (\tau)$ with its orientation $\displaystyle (\theta)$ in the field. Find the orientation in which torque is (i) zero and (ii) maximum.
Marking-scheme solution
(i)
Torque is zero for orientation corresponding to $\displaystyle \theta = 0^{0}$ and $\displaystyle \theta = 180^{0}$
(ii)
Torque is maximum for orientation corresponding to $\displaystyle \theta = \dfrac{\pi}{2}$ and $\displaystyle \dfrac{3\pi}{2}$
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.