An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?
A
0.25Ω
B
5.00Ω
C
19.80Ω
D
0.05Ω
Verified Correct Answer: D.
Physical Principles & Numerical Solution
R\(_s\) = \(\frac{(i_gr_g)}{I-i_g}\) = \(\frac{(50 \times 10^{-3} \times 5)}{5 - (50 x 10^{-3})}\) = \(\frac{(0.25)}{4.95}\) = 0.0505 = 0.05Ω
Source: Myschool Past Questions Archive (Record #13879)