WAEC - Physics (1990 - No. 42) | ExamPlay

WAEC - Physics (1990 - No. 42)

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

80Ω

75Ω

45Ω

20Ω

10Ω

解释

R/30 = 100/150R = 20Ω

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