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AP EAMCET202022 Sep 2020Morning ShiftPhysicsAlternating CurrentActual

In a series, L-C-R circuit

Options

  1. Athe voltage leads the current if X_L < X_C
  2. Bthe voltage leads the current if X_L>X_C
  3. Cthe voltage and current are in phase
  4. Dthe current leads the voltage if X_L>X_C

Correct answer

B. the voltage leads the current if X_L>X_C

Step-by-step solution

Phasor diagram of L-C-R series circuit is shown in the following figure, For phasor diagram, it is clear that if V_L>V_C , then voltage V leads angle from current. where, = ⁻¹ ( V_L-V_C V_R )= ⁻¹ ( X_L-X_C R ) Hence, voltage leads the current with angle , when V_L>V_C I X_L>I X_C X_L>X_C

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