JEE Physics 2023 Question with Solution

Given: The circuit between terminals A and B.

Find: The equivalent resistance $R_{\text{eq}}$ between A and B.

From the circuit reduction shown, both $4 \, \Omega$ resistors are shorted, so they do not contribute to the equivalent resistance.

Now the remaining network gives

The parallel combination is

Substituting,

Therefore, the equivalent resistance between A and B is $10 \, \Omega$.

Given: The circuit between terminals A and B.

Find: The equivalent resistance $R_{\text{eq}}$.

Observe the circuit carefully. The two $4 \, \Omega$ resistors are connected across points that are already joined by an ideal wire path, so the potential difference across each of them is zero. Hence, no current flows through them and they can be removed.

After removing those resistors, the circuit reduces to a series combination of $3 \, \Omega$, the middle parallel part $(2 \parallel 2)$, and $6 \, \Omega$.

So,

with

Thus,

Therefore, the numerical value of the equivalent resistance is 10.