Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge is balanced for some specified value of frequency.
 The bridge can be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.
 The bridge can not be balanced.

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 only the magnitude of the quantity being measured.
 both of above.
 magnitude, phase and waveform of the quantity being measured.
 only phase of the quantity being measured.

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