Question

400 Ω  series resistance is required to convert a galvanometer of 100 Ω  to a voltameter of range 10 V. To convert same galvanometer, in ammeter of 10A, what should be the shunt resistance

(1) 4 Ω 

(2) 0.4 Ω 

(3) 0.2 Ω 

(4) 5 Ω 

Answer 1

Correct Option is (3) 0.2 Ω 

\(l_g = \frac{10}{500}= \frac{1}{50}A\) 

\(\Rightarrow\) 10r = \(\frac{1}{50}\times100\)  

r = 0.2Ω