`A 12 V` battery connected to a `6 Omega, 10 H `coil through a switch drives a constant current in the circuit. The switch is suddenly opened. Assuming that it took 1 ms to open the switch, calculate the average emf induced across the coil.

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Calculate the initial current (I1) in the circuit
The initial current flowing through the circuit can be calculated using Ohm's Law:
\[ I = \frac{E}{R} \]
Where:
- \( E = 12 \, V \) (voltage of the battery)
- \( R = 6 \, \Omega \) (resistance)
...