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?

  • 80Ω
  • 75Ω
  • 45Ω
  • 20Ω checkmark
  • 10Ω

The correct answer is: D

Explanation

R/30 = 100/150R = 20Ω
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