A \(12\mathrm{V}\) battery connected to a coil of resistance \(6\Omega\) through a switch, drives a constant current in …

A \(12\mathrm{V}\) battery connected to a coil of resistance \(6\Omega\) through a switch, drives a constant current in the circuit. The switch is opened in \(1\mathrm{ms}\) . The emf induced across the coil is \(20\mathrm{V}\). The inductance of the coil is:

[JEE Main 2023, 15 Apr (Shift 1)]