A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 21 and resistance R of the same material has area of cross-section equal to
A. 2 A
B. \(\frac{\mathrm{A}}{2}\)
C. \(\frac{3 \mathrm{A}}{2}\)
D. 3 A
Answer:A
A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 21 and resistance R of the same material has area of cross-section equal to
A. 2 A B. \(\frac{\mathrm{A}}{2}\) C. \(\frac{3 \mathrm{A}}{2}\) D. 3 A