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Wheatstone Bridge

A circuit con...

Question

A circuit consisting of five resistors each of resistance R, forming a Wheatstone bridge. What is the equivalent resistance of the circuit?

A

2 R

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B

R

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C

2 R / 3

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D

R / 2

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Solution

The correct option is B $R$
The bridge is in balanced condition because the four arms have equal resistances. Thus the bridge resistance can be ignored and we have two parallel branches each of resistance 2R, so the effective resistance is R.

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