Q70 / 75 · JEE Main 2025 (29 Jan Shift 2) · Physics

An electric dipole is placed at a distance of 2 cm from an infinite plane sheet having positive charge density $\sigma_{\mathrm{o}}$. Choose the correct option from the following. Figure

  • A
    Potential energy and torque both are maximum.
  • B
    Torque on dipole is zero and net force is directed away from the sheet.
  • C
    Torque on dipole is zero and net force acts towards the sheet.
  • Correct answer
    D
    Potential energy of dipole is minimum and torque is zero.

Solution

Electric field due to sheet $E=\frac{\sigma}{2 \varepsilon_0}$ and torque on dipole $\vec{\tau}=\vec{P} \times \vec{E}$ here $\vec{\tau}=0$ and $U=-\vec{P} \cdot \vec{E} \rightarrow$ should be minimum

Hence, the correct answer is option: 'D'.

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