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? |
The kinetic energy decreases The acceleration falls down Perpetual-motion machine can be constructed Energy conservation still holds |
Perpetual-motion machine can be constructed |
Only 3 is correct. |