. How does the resistance of a wire change when? a). its length is tripled b). its radius is tripled c). its material is changed to one whose resistivity is three times
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Answer:
it's radius is tripled
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Answer:
R = p. 1/A
(a) I → 3l
R’ = P. 3 l/A = 3 R
Resistance gets tripled,
(b) d → 3d
R = p. I/A = R = P. 1/ πr2 = P.1/π(d/2)2
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