Question

A bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration

• A. $=g$
• B. Zero
• C. $<g$
• D. $>g$

Answer 1

Answer: (C)

$<g$

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