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

Physics
WAEC 1990

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
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Correct Answer: Option D
Explanation
R/30 = 100/150R = 20Ω

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