The current in a coil of inductance 0.2 H changes from 5A to 2A in 0.5 sec. The magnitude of the average induced emf in the coil is

Question

The current in a coil of inductance 0.2 H changes from 5A to 2A in 0.5 sec. The magnitude of the average induced emf in the coil is (A) 0.6 V (B) 1.2 V (C) 30 V (D) 0.3 V

Tardigrade Admin · Accepted Answer

Average induced emf, ϵ= L dl / dt =0.2((5-2) / 0.5)=2 / 5 × 3=1.2 V

Q. The current in a coil of inductance $0.2 H$ changes from $5 A$ to $2 A$ in $0.5 sec$ . The magnitude of the average induced emf in the coil is

0.6 V

1.2 V

30 V

0.3 V

Average induced emf, $ϵ = L d l / d t$
$= 0.2 ((5 - 2) /0.5) = 2/5 \times 3 = 1.2 V$

Q. The current in a coil of inductance 0.2H changes from 5A to 2A in 0.5sec. The magnitude of the average induced emf in the coil is