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Class 12 NEET Physics Current Electricity Questions Part 1
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© examsnet.com
Question : 35
Total: 100
Three resistances
P
,
Q
,
R
each of
2
Ω
and an unknown resistance
S
form the four arms of a Wheatstone bridge circuit. When a resistance of
6
Ω
is connected in parallel to
S
the bridge gets balanced. What is the value of
S
?
(2007)
3
Ω
6
Ω
1
Ω
2 Ω
Validate
Solution:
Let
X
be the equivalent resistance between
S
and
6
Ω
∴
1
X
=
1
S
+
1
6
.....(i)
Therefore, the equivalent circuit diagram drawn below.
For a balanced Wheatstone's bridge, we get
P
Q
=
R
X
or
2
2
=
2
X
⇒
X
=
2
Ω
From eqn. (i), we get
1
2
=
1
S
+
1
6
or
,
1
S
=
2
6
or
,
S
=
3
Ω
© examsnet.com
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