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QPage 120: Q6: HC Verma: Concepts of Physics - Volume 2 Electric Field Potential Page 120: Q6 Solution: An electric dipole is placed in an electric field generated by…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently apply the uniform‑field dipole rule (zero net force, torque = $p\times E$) to a dipole in a point‑charge field, ignoring that $E$ varies across the dipole; thus they wrongly assume the force must vanish or the torque must be non‑zero. Evaluate the forces on each charge separately and check both net force and torque, noting that both may be zero only for special positions or alignment.

An electric dipole is placed in an electric field generated by a point charge.

Multiple Choice Options

  • A The net electric force on the dipole must be zero.
  • B The net electric force on the dipole may be zero.
  • C The torque on the dipole due to the field must be zero.
  • D The torque on the dipole due to the field may be zero.

Step-by-Step Verified Solution

**Answer:** (b), (d). **Step-by-Step Explanation:** The net force on a dipole in a non-uniform field may be zero (b). The torque may be zero (d) if the dipole is aligned with the field.

All Questions in this Chapter

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