Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode $\mathrm{D}_{1}$ in the circuit is ______ mA. (Assume all diodes in the given circuit are identical)

JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Current Electricity

Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode

D_{1}

in the circuit is ______ mA. (Assume all diodes in the given circuit are identical)

Answer: (D)

The

12 V

source drives current through

R_{1} = 0.3 k Ω = 300 Ω

into the three parallel silicon diodes. Diode

D_{2}

is connected with its arrow opposite to the direction of the conventional current, so it is reverse biased and carries no current; only

D_{1}

and

D_{3}

are forward biased, each dropping

0.7 V

. Applying Kirchhoff's voltage law along the path through one conducting diode:

12 = I (300) + 0.7

I = \frac{11.3}{300} = 37.67 mA

This current reaches the common node and divides equally between the two identical conducting diodes

D_{1}

and

D_{3}

I_{D_{1}} = \frac{37.67}{2} = 18.8 mA

JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Single correct option