Question

If value of R is changed, then

(A) Voltage across L remains
same
(B) Voltage across C remains
same
(C) Voltage across LC
combination remains same
(D) Voltage across LC
combination changes​

Answer 1

Answer:

(d)is the answer.........

Answer 2

Explanation:

• The voltage delivered by the AC source is circulated in the RLC components in accordance with their impedances.

• Therefore, when the value of R changes, the current in the circuit varies and so thus the voltage through the LC combination.

$i = current\\j = \sqrt{-1}\\V = iR + j(iX_{c}-iX_{l})$

• As V changes, i changes as well.

• Thus, the voltage across $Lc=(-jX_{c} -jX_{l} )$, Changes.