Verified Solution • 2025–26 Session moderate

QPages 303-304: Q4: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 303-304: Q4 Solution: A short magnet is moved along the axis of a conducting loop.…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently think Lenz's law means the induced field always pushes the magnet away, ignoring that the induced current opposes the *change* in flux. Remember: if flux increases (magnet approaching) the loop creates a field opposite to the magnet’s field (repulsion); if flux decreases (magnet receding) the loop creates a field in the same direction as the magnet’s field (attraction). Use the right‑hand rule to determine the current direction for each case.

A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.

Step-by-Step Verified Solution

**Answer:** The loop repels the approaching magnet and attracts the receding magnet. **Step-by-Step Explanation:** When the magnet approaches, the magnetic flux through the loop increases. By Lenz's law, the induced current opposes this increase, creating a magnetic field that repels the magnet. When the magnet recedes, the flux decreases, and the induced current opposes this decrease, creating a magnetic field that attracts the magnet.

All Questions in this Chapter

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