In a closed circuit, the resitance of a resistor is 2 ohm. Find the resistance if: a)Length of wire is doubled b) Area of cross section is doubled c) Area of cross section is halved
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Answer:
We know
R=ρ
A
l
, now area becomes half and length is double .
R
1
=ρ
2
A
2l
=ρ
A
4l
=4R
Explanation:
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