When you push a bar magnet towards a single-turn coil, you feel an opposing force. If the magnet is pushed towards a coil with many turns, why is the opposing force greater?

According to Lenz’s Law, the induced current in the coil opposes the motion of the magnet. When the coil has more turns, the induced emf and current increase, producing a stronger opposing magnetic field. This results in a greater opposing force felt on your hand.

Related Questions:

  1. Two parallel straight conductors carrying current in the same direction attract each other? Explain why. What will you conclude if the direction of current in conductors is opposite?
  2. Bar magnets are dropped in long pipes made up of plastic and copper (of the same length) simultaneously. The bar magnet comes out later through the copper pipe than through the plastic pipe. Why?
  3. What is the direction of rotation of the coil (shown in the figure) when the switch is closed? Label the diagram with the direction of forces forming a couple and the rotation of the coil.
  4. A bar magnet is moving near a ring. What is the direction of the induced current in the ring when:
  5. Why is the output of a transformer zero if DC voltage is applied to its primary coil?
  6. Why are coils of a transformer wound on an iron core?
  7. Why is step-up transmission used for long-distance transmission?
  8. Numerical Problems – Chapter 15: Electromagnetism
  9. Physics 10 MCQ
  10. Simple harmonic motion and waves
  11. Simple harmonic motion and waves-NFE
  12. Give an example of vibratory motion which is not simple harmonic motion. Give a reason for your selection.
  13. At the extreme position, velocity is zero but acceleration is maximum in simple harmonic motion. How can you theoretically explain it?
  14. What will happen to the acceleration of a mass-spring system if its mass is doubled?
  15. A simple pendulum has a time period “T”. What will happen to its time period if its thread length is shortened to half?
  16. A simple pendulum has a time period of 4 seconds. Will its time period remain the same or change if its steel bob is replaced by a wooden bob of the same size?
  17. Same masses are attached to different springs, one is vibrating faster. Why?
  18. A simple pendulum has a time period “T” in Murree. In Karachi, it has a different time period. What would you do to make its time period the same as it was in Murree?
  19. What will happen to the frequency of waves in a ripple tank if the time period of the electrical vibrator is decreased? What will happen to the wave speed?
  20. Why do water waves refract at the boundary of shallow water and deep water in a ripple tank experiment?