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Voltages across R, L and C in series: V squared = VR squared + (VL - VC) squared

This type of question, asked 4 times: May 2021 S1, 16 May 2023 S2, 11 May 2024 S2, 18 Apr 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    May 2021 S1

    24
    A series L-C-R circuit is connected to a source of alternating emf of 50 V and the potential difference across inductor and capacitor is 90 V and 60 V, respectively. The potential difference across the resistor is

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  2. Question 2

    16 May 2023 S2

    16
    In an LCR circuit, if VV is the effective value of the applied voltage, VRV_R is the voltage across RR, VLV_L and VCV_C is the effective voltage across LL and CC respectively then

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  3. Question 3

    11 May 2024 S2

    46
    The a.c. source is connected to series LCR circuit. If voltage across R is 40 V, that across L is 80 V and that across C is 40 V, then the e.m.f. 'e' of a.c. source is

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  4. Question 4

    18 Apr 2026 S2

    139
    In an LCR series circuit, the potential difference across the terminals of the inductor, capacitor and resistor is 60 V, 30 V and 40 V respectively. Then supply voltage will be equal to

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