JEE Main · 2021 · 25 Feb 2021 · Shift 1 · Semiconductors

A 5 V battery is connected across the points X and Y . Assume

D_{1}

and

D_{2}

to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point X .

(A) $\sim 0.5 A$
(B) $\sim 0.43 A$ ✓ Correct
(C) $\sim 0.86 A$
(D) $\sim 1.5 A$

Answer: (B)

Solution

When the positive terminal is connected to X, diode

D_{1}

is forward biased and

D_{2}

is reverse biased. Only

D_{1}

conducts with a forward voltage drop of approximately 0.7 V (for silicon).

The effective voltage across the 10 Ω resistor = 5 V - 0.7 V = 4.3 V.

Current

i = \frac{4.3}{10} = 0.43

JEE Main · 2021 · 25 Feb 2021 · Shift 1 · Single correct option

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