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Byju's Answer
Standard XIII
Physics
Kirchhoff's Voltage Law
In the circui...
Question
In the circuit shown, what is the potential difference
V
P
Q
between points
P
and
Q
?
A
+
3
V
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B
+
2
V
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C
−
2
V
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D
None
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Solution
The correct option is
B
+
2
V
Using Kirchhoffs junction law, current in the circuit can be assumed as:
Using
K
V
L
in loop ABQCA
−
5
I
1
+
1
+
4
=
0
I
1
=
1
A
Using
K
V
L
in loop APDCA
−
1
(
I
−
I
1
)
+
2
−
2
(
I
−
I
1
)
+
4
=
0
3
(
I
−
I
1
)
=
6
⇒
3
I
−
3
I
1
=
6
I
=
3
A
Now
K
V
L
between points P and Q
V
P
=
−
2
+
2
(
I
−
I
1
)
+
V
Q
V
P
=
−
2
+
2
(
2
)
+
V
Q
V
P
−
V
Q
=
2
V
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