In a unbalanced wheatstone bridge the potential between the galvanometer is not
zero. If the galvanometer resistance is 20Ω, what is the galvanometer current? Lets
take Voltage = 20V , P/Q ratio as 4, known resistance as 6Ω and unknown resistance
as 3Ω.
Answers
Answered by
0
The balanced condition for Wheatstones bridge is
Q
P
=
S
R
as is obvious from the given values.
No, current flows through galvanometer is zero.
Now, P and R are in series, so
Resistance,R
1
=P+R
=10+15=25Ω
Similarly, Q and S are in series, so
Resistance R
2
=R+S
=20+30=50Ω
Net resistance of the network as R
1
and R
2
are in parallel
i=
R
V
=
50
6×3
=0.36 A.
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