Resistance of a wire is ‘r’ ohm. If the wire is stretched to double its length, then its resistance in ohm is
A. \(\frac{r}{2}\)
B. 4 r
C. r
D. \(\frac{r}{4}\)
Answer:B
Resistance of a wire is ‘r’ ohm. If the wire is stretched to double its length, then its resistance in ohm is
A. \(\frac{r}{2}\) B. 4 r C. r D. \(\frac{r}{4}\)