Two wires of the same material and same length have radi 3r and 2r respectively. Compare their I) resistance and ii) resistivity
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Explanation:
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Answered by
0
Answer:
(i)R=
A
fl
According to the question
R
1
=
π(1×10
−3
)
2
fl
R
2
=
π(2×10
−3
)
2
fl
R
2
R
1
=
(1×10
−3
)
2
(2×10
−3
)
2
=
1
4
Thus,R
1
:R
2
::4:1 i.e, first resistance is four times the second resistance
(ii) specific resistance ≅ Resistivity (f) depends on
the material of the wire and as according
to the question both wires are of same
material ⇒ resistivity of both wires is same.
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