When the length and area of cross-section both are doubled, then its resistance

Options

A. will become half
B. will be doubled
C. will remain the same
D. will become four time

Answer

C

Explanation

(c ) `R_(1) prop (1)/(A) implies R_(2) prop (21)/(2A)` i.e., `R_(2) prop (1)/(A)`
`:. R_(1) = R_(2)`