Q. An ammeter has resistance $R_{0}\ and\ range\ I.$ What resistance should be connected in parallel with it to increase its range by$\ nI$?
A) $R_{0}/(n - 1)$
B) $R_{0}/(n + 1)$
C) $R_{0}/n$
D) None of these
Explanation
(c) Given, $i_{g} = i,\ G = R_{0};$
$i\ \ = n\ i + i = (n + 1)\ \ i$
$\therefore\ S = \ \frac{i_{g}\ G}{i - i_{g}} = \frac{iR_{0}}{(n + 1)i - i} = \frac{R_{0}}{n}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.