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Q.

In series LCR resonance circuit , if we change the resistance only , from a lower to higher value:

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a

The quality factor and the resonance frequency will remain constant

b

The quality factor will increase

c

The bandwidth of resonance circuit will increase

d

The resonance frequency will increase 

answer is C.

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Detailed Solution

Bandwidth =RL As R increases, BW also increases.

Quality factor=Q =  1RL/C As R increases, Q decreases.

Resonance frequency =f=12π1LC f is independent of R.
 

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In series LCR resonance circuit , if we change the resistance only , from a lower to higher value: