Which of these statements about the resistance of a metal wire is correct?
- AThe resistance is directly proportional to its length and directly proportional to its cross-sectional area.
- BThe resistance is directly proportional to its length and inversely proportional to its cross-sectional area.
- CThe resistance is inversely proportional to its length and directly proportional to its cross-sectional area.
- DThe resistance is inversely proportional to its length and inversely proportional to its cross-sectional area.