The resistance of a moving coil galvanometer is 20 ohm

Asked by admin @ 03/08/2021 in Physics viewed by 328 People

the resistance of a moving coil galvanometer is 20ohm . it require 0.01A current for full scale deflection. Calculate the value of resistance require d to convert it into a voltmeter of range 20volts.

Answered by admin @ 03/08/2021

ANSWER
Given data:
G=20Ω I
g

=50×10
−3
A;I=20A,
S=?;V=120V,R=?
Solution:
i) ∴S=G.
I−I
g

I
g

=
20−50×10
−3

20×50×10
−3

=
20−0.05
1

S=0.05Ω
A shunt of 0.05Ω should be connected in parallel.
ii) R=
Ig
V

−G
=
50×10
−3

120

−20=2400−20=2380Ω
R=2380Ω.

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