TS EAMCET · Physics · Current Electricity
A cylindrical metallic wire is stretched to increase its length in such a way that the metallic wire changes its resistance by . The percentage increase in its length is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Resistance of a uniform wire is given by, R=ρLA. As volume will remain constant, therefore, AL=V⇒A=VL So we can write resistance as, R=ρLVL=ρVL2 Now for small changes we can write,…
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