The barrier potential developed in a diode is 0.5 V, then the value of the current in the circuit shown below is:

40 mA

The correct answer is Option (4) → 40 mA

$ΔV$, The potential barrier developed by the coil = 0.5 V [Given]

∴ Electric current = $I = \frac{ΔV}{e}$ [By ohm's law]

where,

R = Resistance in circuit

$I=\frac{4}{100}=40mA$