What is the value of R when G shows no deflection in the circuit illustrated…

What is the value of R when G shows no deflection in the circuit illustrated above?
  • A.
    80Ω
  • B.
    75Ω
  • C.
    45Ω
  • D.
    20Ω
  • E.
    10Ω
Correct Answer: Option D
Explanation

R/30 = 100/150R = 20Ω

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