Physics-
General
Easy
Question
A box P and a coil Q are connected in series with an ac source of variable frequency. The rms value of emf of source is constant at 10 V. Box P contains a capacitance of 
in series with a resistance of 
. Coil Q has a self-inductance 
and a resistance of 
in series. The frequency is adjusted so that the maximum current flows in P and Q.
Impedance of p at this frequency is.
- 77ohm
- 87ohm
- 67ohm
- 57ohm
The correct answer is: 77ohm
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