Verified Solution • 2025–26 Session moderate

QPages 197-198: Q2: HC Verma: Concepts of Physics - Volume 2 Electric Current in Conductors Pages 197-198: Q2 Solution: A capacitor with no dielectric is connected to a battery at t = …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that a magnetic field exists only where conduction current flows, ignoring that the changing electric field between capacitor plates creates a displacement current. This displacement current is equal in magnitude to the conduction current in the wires, so a magnetic field is present at both the wire (point A) and the gap (point B).

A capacitor with no dielectric is connected to a battery at t = 0. Consider a point A in the connecting wires and a point B between the plates.

Multiple Choice Options

  • A a) There is a magnetic field at A but not at B,
  • B b) There is a magnetic field at B but not at A,
  • C c) There is a magnetic field at A as well as at B,
  • D d) There is no magnetic field at A and B

Step-by-Step Verified Solution

**Answer:** (a) There is a current through A as long as the charging is not complete. **Step-by-Step Explanation:** During charging, current flows through the connecting wires (point A). Between the plates (point B), there is displacement current, not conduction current.

All Questions in this Chapter

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