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KCET2009PhysicsCurrent Electricity

Three resistors 1 , 2 and 3 are connected to form a triangle. Across 3 resistor a 3 ~V battery is connected. The current through 3 resistor is

Options

  1. A0.75 ~A
  2. B1 ~A
  3. C2 ~A
  4. D1.5 ~A

Correct answer

B. 1 ~A

Step-by-step solution

Required arrangement is shown in figure. The equivalent circuit will look like (since the two resistances of 1 and 2 are in series, which form 3 which is in parallel with 3 resistance). Therefore, the effective resistance is (1+2) 3 (1+2)+3 = 3 2 Current in the circuit, I= 3 (3 / 2) =2 ~A Current in 3 resistor = I 2 =1 ~A

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