Current Electricity Charging Discharging Of Capacitors Question 248
Question: An ammeter whose resistance is $ 180,\Omega $ gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is
[EAMCET (Engg.) 1995]
Options:
A) 18
B) 20
C) 0.1
D) 10
Show Answer
Answer:
Correct Answer: B
Solution:
Given $ i _{g}=2mA, $
$ i=20mA,,G=180\Omega $
$ \frac{i _{g}}{i}=\frac{S}{G+S} $
Therefore $ 180+S=10S $
Therefore $ S=\frac{180}{9}=20\Omega $
BETA
