The length of a given cylindrical wire is increased by 100%. Due to consequent decrease in diameter, the change in resistance of wire will be :-
a. 100% b. 200%
c. 50% d. 300%
a. 100% b. 200%
c. 50% d. 300%
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Answer:
As we know
R = p L/A
New l` = 2l ..
Due to increase in length, area must decrease as volume remains constant..
Al = A`l`
Hence, A` = A/2
New Resistance R` = pl`/A` = 4pl/A
Change in resistance = 3pl/A or 300 %
D) is the answer
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Answer:
The answer of this question is(d).