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The following series L-C-R circuit , whe...

The following series L-C-R circuit , when driven by an emf source of angular frequency 70 kilo-radians per second , the circuit effectively behaves like

A

purely resistive circuit

B

series R-L circuit

C

series R-C circuit

D

series L-C circuit with R = 0

Text Solution

Verified by Experts

The correct Answer is:
B
Resonance frequency,
`underset(o)(omega)= 1/sqrt LC= 1/sqrt 100 xx 10^(-6) xx 1 xx 10^(-6) = 10^(5) rads^(-1)`
Now, given `omega` = 70 kilo-`rads^(-1)` = `70000 rads^(-1)`
`impliesunderset(o)(omega)gtomega`
As `underset(L)(X ) propto omega` and `underset(C )(X)propto1/omega`
`therefore` `underset(L)(X) gt underset(C )(X)`
The circuit will be R-L circuit.
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