JIPMER 2019 Morning Papers Online Practice

(4)
To convert a galvanometer into voltmeter, high resistance should be connected in series with it. Let R is the resistance connected in series with the galvanometer.

ig=

V

G+R

or R=

V

ig

−G
Given, G = 50Ω,
ig = 25 × 4 × 10 ‌−4 = 10 ‌−2 A, V = 25V
∴ R =

25

10−2

– 50 = 2500 – 50 = 2450Ω