Resistance increases as frequency increases because RF current flows closer to the surface✓Correct answer
Resistance decreases as frequency increases because electron mobility increases
Resistance increases as temperature increases because of the change in thermal coefficient
Resistance decreases as temperature increases because of the change in thermal coefficient
Explanation
As frequency rises, the magnetic field inside a conductor forces current toward the outer surface, so less and less of the cross section carries current. The effective cross-sectional area shrinks and the conductor's resistance rises with frequency.