Answer:
(a) Here, length is
doubled and area of cross-section is halved. Thus, a wire of length and area of cross-section
A becomes a wire of length and
area of cross-section
Using
New
resistance,
i.e.,
resistance becomes four times
(b)
Resistivity of a substance does not depend on its length or area of cross-section.
It depends on the nature of the material and temperature. Hence there is no
change.
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