A current through a choke coil of self inductance `2H` decreases at the rate of `0.5A//s`. The e.m.f. developed across the coil is

The current passing through a choke coil of inductance 4 Henry is decreasing at the rate of 3 amp//sec . The e.m.f developed across the coil is

The current passing through a choke coil of 5 Henry is decreasing at the rate of 2 A//sec. The e.m.f. developing across the coil is

The current passing through a choke coil of 5H is decreasing at the rate of 2A/s. The e.m.f. developed across the coil is?

The current passing through a choke coil of 5H decreases at the rate of 2 ampere per second. The emf developed across the coil is