A loosely wound helix made of stiff metal wire is mounted vertically with the lower end just
Channel: Doubtnut
Date: 2020-08-16

A loosely wound helix made of stiff metal wire is mounted vertically with the lower end just touching the mercury in a dish. When the current from a batter is started in the metal wire through the mercury, the wire executes oscillatory motion with the lower end jumping out of and into the mercury. Explain.