Verified Solution • 2025–26 Session moderate

QPages 304-305: Q6: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 304-305: Q6 Solution: Figure shows a horizontal solenoid connected to a battery and a …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume the ring's motion depends on the battery polarity or current direction, leading them to select the 'depending on terminal' option. However, Lenz's law dictates that the induced current always opposes the change in flux; since closing the switch increases flux in either direction, the repulsive force pushing the ring away is independent of the solenoid's magnetic polarity.

Figure shows a horizontal solenoid connected to a battery and a switch. A copper ring is placed on a frictionless track, the axis of the ring being along the axis of the solenoid. As the switch is closed, the ring will _____________ .

Multiple Choice Options

  • A remain stationary
  • B move towards the solenoid
  • C move away from the solenoid
  • D move towards the solenoid or away from it depending on which terminal positive or negative) of the battery is connected to the left end of the solenoid

Step-by-Step Verified Solution

**Answer:** (c) move away from the solenoid. **Step-by-Step Explanation:** When switch is closed, current increases, flux through the ring increases. By Lenz's law, the ring moves away to oppose the increase.

All Questions in this Chapter

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