Explanation
The given circuit is a balanced Wheatstone bridge circuit. Hence potential difference A and B is zero.
Given circuit is a balanced Wheatstone bridge circuit. So there will be no change in equivalent resistance. Hence no further current will be drawn.
For maximum energy equivalent resistance of combination should be minimum.
Kirchhoff’s first law is based on the law of conservation of charge.
According to kirchhoff's voltage law only option (a) is correct.
Zero (No potential difference across voltmeter).
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