Answer:
The resistivity of a
material is defined as the resistance of a conductor made of that material of
unit length and unit cross-sectional area.
Using,
Also,
V = RI
R is
doubled while V remains unchanged. Hence, current becomes half.
The
resistance of a conductor depends on:
(i)
its length,
(ii)
its area of cross-section,
(iii)
the nature of its material and
(iv)
temperature of the conductor.
[NCERT]
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