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Standard X
Physics
Electric Power
Potential dif...
Question
Potential difference between the points P and Q in the electric circuit shown is
A
4.5 V
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B
1.2 V
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C
2.4 V
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D
2.88 V
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Solution
The correct option is
D
2.88 V
In the given circuit, current flowing through 3 ohm resistor is parallel to the resistances in either sides of branch PQ.
Hence, equivalent resistance
R
e
q
, is
1
R
e
q
=
1
8
+
1
3
+
1
16
1
R
e
q
=
1
3
+
3
16
R
e
q
=
16
×
3
25
∴
V
P
−
V
Q
=
i
R
e
q
=
1.5
×
16
×
3
25
=
2.88
v
o
l
t
.
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