A junction diode is connected to an external resistance of 100`Omega` and a source of e.m.f. 3.0V. If potential barrier developed in the junction diode is 0.7, obtain the current in the circuit.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the circuit
We have a junction diode connected to an external resistance (R) of 100 ohms and a source of electromotive force (e.m.f) of 3.0V. The potential barrier (V_b) of the diode is given as 0.7V.

### Step 2: Apply Kirchhoff's Voltage Law (KVL)
According to KVL, the sum of the potential differences (voltage) around a closed loop must equal zero. In our circuit, we can write the equation as:
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