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AP EAMCET Engineering 2014 Code A Solved Paper
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© examsnet.com
Question : 107
Total: 160
Wires A and B have resistivities
ρ
A
and
ρ
B
,
(
ρ
B
=
2
ρ
A
)
and have lengths
l
A
and
l
B
. If the diameter of the wire B is twice that of A and the two wires have same resistance, then
l
B
l
A
is
1
1
2
1
4
2
Validate
Solution:
(
ρ
l
A
)
A
=
(
ρ
l
A
)
B
⇒
l
B
l
A
=
ρ
A
ρ
B
×
A
B
A
A
=
1
2
×
4
1
=
2
© examsnet.com
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