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

4.5 ohm

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12 ohm

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9 ohm

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

The correct option is A 4.5 ohmFrom the circuit 154=R+3215=2R+6R=92=4.5Ω

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