TS EAMCET · Physics · Magnetic Effects of Current
A cylindrical metallic wire is stretched to increase its length. If the resistance of the wire is increased by then the percentage increase in its length is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
In the above case the volume and specific resistivity of the wire does not change, it means, V1=V2⇒πr12l1=πr22l2⇒r12r22=l2l1 Now recall the formula of resistance in terms of specific resistivity, R=ρ×lπr2…
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