Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Induction

Question:

Case : Read the passage and answer the question(s).

Lenz's Law states that the polarity of induced EMF is such that it tends to produce a current which opposes the change in magnetic flux that produced it. Hypothetically or not, assume that on approaching the magnetic north pole towards a coil, the coil develops current in clockwise direction. 

If the above statement be true, which of the following holds correct?

Options:

The kinetic energy decreases

The acceleration falls down

Perpetual-motion machine can be constructed

Energy conservation still holds

Correct Answer:

Perpetual-motion machine can be constructed

Explanation:
  1. The kinetic energy increases.
  2. The acceleration increases.
  3. Energy conservation fails.

Only 3 is correct.