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NEET2023PhysicsCurrent ElectricityActual

If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by:

Options

  1. A400   Ω
  2. B200   Ω
  3. C50   Ω
  4. D100   Ω

Correct answer

D. 100   Ω

Step-by-step solution

As given in the question, I g = 0 Potential drop across R will be equal to 2   V . Now, current through the left circuit can be written as, I = 10 400 + R . Therefore, potential drop across R will be, V R = I R ⇒ 2 = 10 R 400 + R ⇒ 800 + 2 R = 10 R ⇒ R = 100   Ω

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