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JEE Main Physics Class 12 Moving Charges and Magnetism Part 1 Questions
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© examsnet.com
Question : 42
Total: 100
A
50
Ω
resistance is connected to a battery of
5
V
. A galvanometer of resistance
100
Ω
is to be used as an ammeter to measure current through the resistance, for this a resistance
r
s
is connected to the galvanometer. Which of the following connections should be employed if the measured current is within
1
%
of the current without the ammeter in the circuit?
[Online April 9,2016]
r
s
=
0.5
Ω
in series with the galvanometer
r
s
=
1
Ω
in series with galvanometer
r
s
=
1
Ω
in parallel with galvanometer
r
s
=
0.5
Ω
in parallel with the galvanometer.
Validate
Solution:
As we know,
I
=
V
R
=
5
50
=
0.1
I
′
=
0.099
When Galvanometer is connected
R
e
q
=
50
+
100
S
100
+
S
=
V
I
⇒
100
S
100
+
S
=
5
0.099
−
50
⇒
100
S
100
+
S
=
50.50
−
50
⇒
100
S
100
+
S
=
0.5
⇒
100
S
=
50
+
0.55
⇒
99.5
S
=
50
S
=
50
99.05
=
0.5
Ω
So, shunt of resistance
=
0.5
Ω
is connected in parallel with the galvanometer.
© examsnet.com
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