First slide

combination of resistance

Question

For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure?

Moderate

A

$4 Ω$
B

$6 Ω$
C

$2 Ω$
D

$5 Ω$

Solution

For balanced Wheatstone bridge, $\frac{P}{Q} = \frac{R}{S}$
$\Rightarrow \frac{12}{(1 / 2)} = \frac{X + 6}{(1 / 2)} \Rightarrow X = 6 Ω$

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