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Standard IX
Physics
Equivalent Resistance in Series Circuit
A 9 Ω resis...
Question
A
9
Ω
resistance is cut into three equal parts and connected in parallel. Find the equivalent resistance of the combination.
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Solution
When the wire is cut into three equal parts the length of each part will be
1
3
And resistance is directly proportional to the length.
∴
the resistance of each parts will be
R
=
9
3
=
3
Ω
Now we have three resistor each of
3
Ω
connected parallel,
1
R
e
q
=
1
3
+
1
3
+
1
3
1
R
e
q
=
1
+
1
+
1
3
=
3
3
=
1
⇒
R
e
q
=
1
Ω
Hence the equivalent resistance of the combination is
1
Ω
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