Q.

When two resistances are connected in parallel then the equivalent resistance is 6/5Ω. When one of the resistance is removed then the effective resistance is 2Ω . The resistance of the wire removed will be

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a

3 ohm

b

2 ohm

c

35ohm

d

65ohm

answer is A.

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Detailed Solution

R1R2R1+R2=65 If R2 is removed R1 =2Ω2R22+R2=65⇒5R2=6+3R2⇒R2=3Ω
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When two resistances are connected in parallel then the equivalent resistance is 6/5Ω. When one of the resistance is removed then the effective resistance is 2Ω . The resistance of the wire removed will be