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Other
Measurement
DC and AC Potentiometer
In the potent...
Question
In the potentiometer circuit shown in the figure, the expression for
V
x
is
A
(
1
−
2
α
)
V
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B
(
1
−
α
)
V
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C
(
α
−
1
)
V
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D
α
V
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Solution
The correct option is
A
(
1
−
2
α
)
V
+
V
+
I
R
+
V
=
0
∴
I
=
−
2
V
R
V
x
=
(
α
R
)
I
+
V
=
α
R
(
−
2
V
)
R
+
V
=
−
2
×
α
×
V
+
V
=
(
1
−
2
α
)
V
Method - 2 (Eliminating options)
A
t
α
=
0
V
x
=
V
So, answer is either (a) or (b)
A
t
α
=
1
V
x
=
−
V
⇒
Answer is (a).
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