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Byju's Answer
Standard X
Physics
Equivalent Resistance of a System of Resistor
In the follow...
Question
In the following circuit the value of total resistance between
X
and
Y
in
o
h
m
is:
A
(
1
+
√
3
)
r
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B
(
√
3
−
1
)
r
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C
∞
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D
50
r
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Solution
The correct option is
D
(
1
+
√
3
)
r
Equivalent resistance
R
e
=
r
+
r
+
1
⎡
⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢
⎣
1
{
(
1
1
r
+
1
3
r
)
+
r
+
r
}
+
1
r
⎤
⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥
⎦
R
e
=
r
+
r
+
1
⎡
⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢
⎣
1
{
(
1
4
3
r
)
+
r
+
r
}
+
1
r
⎤
⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥
⎦
R
e
=
r
+
r
+
1
⎡
⎢ ⎢ ⎢
⎣
1
{
(
3
r
4
)
+
r
+
r
}
+
1
r
⎤
⎥ ⎥ ⎥
⎦
R
e
=
r
+
r
+
1
⎡
⎢ ⎢ ⎢
⎣
1
{
(
11
r
4
)
}
+
1
r
⎤
⎥ ⎥ ⎥
⎦
R
e
=
r
+
r
+
1
[
4
11
r
+
1
r
]
=
r
+
r
+
11
r
15
=
41
r
15
=
2.72
r
Answer: (A)
(
1
+
√
3
)
r
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