Question

What is the effect on selectivity of an ac series LCR circuit if the self-inductance is increased 4 times and resistance is doubled?

Answer 1

IF BOTH VOLTAGE AND RESISTANCE ARE DOUBLED THERE WILL NO CHANGE IN CURRENT

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Answer 2

Given:

Given that, self-inductance is increased 4 times and resistance is doubled.

To find:

We need to find the effect on the selectivity of an ac series LCR circuit.

Solution:

We know that, he selectivity of the LCR circuit is dependent on the quality factor which is dependent on L and R.

L is the inductance and R is the resistance, the quality factor is Q = L/R.

If the Self-inductance is increased 4 times and resistance is doubled, then

Q = 4L/2R

Q = 2L/R

So, the effects on selectivity of an ac series LCR circuit get doubled.