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Wheatstone Bridge

The P.D betwe...

Question

The P.D between A and B will be zero when the resistance R is

A

4.5 ohm

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B

12 ohm

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C

9 ohm

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D

6 ohm

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Solution

The correct option is A 4.5 ohm
From the circuit
$\frac{15}{4} = \frac{R + 3}{2} 15 = 2 R + 6 R = \frac{9}{2} = 4.5 Ω$

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Wheatstone Bridge

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