Question

A small bar magnet is falling vertically downward from certain height through a conducting coil as shown in figure. The acceleration of bar magnet will be

• A. Equal to acceleration due to gravity
• B. Greater than acceleration due to gravity
• C. Less than acceleration due to gravity
• D. First less than acceleration due to gravity and then greater than acceleration due to gravity

Answer 1

The correct option is C Less than acceleration due to gravity

As the magnet will fall, the flux through the coil will increase, according to lenz's law, the coil will induce current to oppose the flux, this current will reduce the acceleration of the magnet so: $a_{magnet}=g-a_{current}$