In the figure, potential difference between A and B is
Question:

In the figure, potential difference between $A$ and $B$ is:

  1. (1) $10 \mathrm{~V}$

  2. (2) $5 \mathrm{~V}$

  3. (3) $15 \mathrm{~V}$

  4. (4) zero


Correct Option: 1

Solution:

(1) The given circuit has two $10 k \Omega$ resistances in parallel, so we can reduce this parallel combination to a single equivalent resistance of $5 \mathrm{k} \Omega$.

Diode is in forward bias. So it will behave like a conducting wire.

$V_{A}-V_{B}=\frac{30}{5+10} \times 5=10 \mathrm{~V}$

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