What is the value of R when G shows no deflection in the circuit illustrated above?
Attached Figure / Diagram
A
80Ω
B
75Ω
C
45Ω
D
20Ω
E
10Ω
Verified Correct Answer: D.
Physical Principles & Numerical Solution
R/30 = 100/150R = 20Ω
Source: Myschool Past Questions Archive (Record #24121)