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Alternating Current — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
Question
In R - L - C series circuit, the potential differences across each element is 20V. Now the value of the resistance alone is doubled, then P.D. across R, L and C respectively.
✓

Answer

  1. 20V, 10V, 10V
Explanation:
Circuit is at resonance (VL = VC)
$\therefore$ circuit is purely resistance
Resistance is doubled, current in the circuit is half the initial value
$\therefore$ New current $\text{I′}=\frac{\text{I}}{2}$
$\therefore$ VR = 20V (equal to applied voltage earlier)
 VL = 10V
 VC = 10V

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