Electric Circuits
In balanced bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This can be explained from which theoem

 Thevinin's theorem
 Compensation theorem
 Norton's theorem
 Reciprocity theorem

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Electric Circuits
The voltage induced in an inductor is represented as,

 ratio of current through it to its inductance.
 product of its inductance and current through it.
 product of its inductance and rate of change of current through it.
 ratio of its inductance to current through it.

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