the lengh is l , cross section area is A resistance is R , if lenght is double them area of cross section?
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Answer:
Length (l) is doubled & Area of cross section (A) is halved.
l becomes 2l & A becomes
2
A
R=P
A
L
now take l=2l,A=
2
A
R=
A/2
P2l
=4P
A
L
⇒4R
Resistance becomes 4 times
1) Resistivity does not depend on its length 02 Area.
Hence, it does not change.
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