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Class 12 NEET Physics Current Electricity Questions Part 1
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© examsnet.com
Question : 5
Total: 100
Two metal wires of identical dimensions are connected in series. If
σ
1
and
σ
2
are the conductivity of the combination is
[NEET 2015]
σ
1
+
σ
2
σ
1
σ
2
σ
1
σ
2
σ
1
+
σ
2
2
σ
1
σ
2
σ
1
+
σ
2
σ
1
+
σ
2
2
σ
1
σ
2
Validate
Solution:
👈: Video Solution
In figure, two metal wires of identical dimension are connected in series
R
e
q
=
1
σ
1
A
+
1
σ
2
A
=
l
e
q
σ
e
q
A
e
q
2
l
σ
e
q
A
=
1
A
(
σ
1
+
σ
2
σ
1
σ
2
)
∴
σ
e
q
=
2
σ
1
σ
2
σ
1
+
σ
2
© examsnet.com
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