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JEE Main2012PhysicsAlternating CurrentActual

In an L C R circuit shown in the following figure, what will be the readings of the voltmeter across the resistor and ammeter if an a.c. source of 220 ~V and 100 ~Hz is connected to it as shown?

Options

  1. A800 ~V , 8 ~A
  2. B110 ~V , 1.1 ~A
  3. C300 ~V , 3 ~A
  4. D220 ~V , 2.2 ~A

Correct answer

D. 220 ~V , 2.2 ~A

Step-by-step solution

In case of series RLC circuit, Equation of voltage is given by V ^2=V_R^2+ (V_L-V_C^2 ) Here, V=220 V ; V_L=V_C=300 ~V V_R= V^2 =220 ~V Current i= V R = 220 100 =2.2 ~A

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