Question

A moving coil meter has a resistance of 25 and indicate full scale deflection when a current of 4.0mA flows through it.How could this meter be converted to a millimeter having a full scale deflection for a current of 50 mA?​

Answer 1

GivenG=25,lg=10mA=10×10 power by 3A,v=100V
To find resistance(Rs)
Formula R
′
s=
lg−G
V
​

Calculations by formula
R
′
s=
(10×10
−3
−25
100
​

=10000−25
=9975
Ans- resistance by 9975Ω