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The arm consisting of the standard known resistance R3 is known as __________

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The arm consisting of the standard known resistance R3 is known as __________

(a) standard arm

(b) resistance arm

(c) accurate arm

(d) known arm

This question was addressed to me in quiz.

The doubt is from Wheatstone Bridge Balance Condition topic in chapter Measurement of Resistance of Electrical Measurements

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Right choice is (a) standard arm

For explanation I would say: The arm consisting of the standard known resistance R3 is known as the standard arm. By making use of this resistance value the unknown resistance can be determined using the balance condition.

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