Q.

Find the resistance of the portion of the circuit between A and B in the circuit shown in figPoints A and P are connected by a copper wire of negligible resistance. Similarly, Points B and Q are also connected by a copper wire of negligible resistance

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a

3R

b

R /3

c

3R/2

d

2R/3

answer is B.

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Detailed Solution

The three resistances are connected in parallel, [fig]Their equivalent resistance R' is given by1R′=1R+1R+1R=3RR′=R/3
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Find the resistance of the portion of the circuit between A and B in the circuit shown in figPoints A and P are connected by a copper wire of negligible resistance. Similarly, Points B and Q are also connected by a copper wire of negligible resistance