Calculate the back e.m.f of a 10H, 200 `Omega` coil 100 ms after a 100Vdc supply is connected to it.

Explanation

To calculate the back electromotive force (e.m.f) of a coil after a certain time has passed since a DC voltage was applied, we can follow these steps:

### Step 1: Identify the given values
- Inductance (L) = 10 H
- Resistance (R) = 200 Ω
- Voltage (V) = 100 V
- Time (t) = 100 ms = 0.1 s

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