Question

Which of the fallowing statements about the electrical resistance R and electrical resistivity ρ is false, not tru?

A)	Electrical resistance R of a conductor increases with increase of temperature.
B)	Electrical resistance R of a cylindrical conductor is inversely ptoportional to the cros-sectional area of the conductor.
C)	Electrical resistance of a conductor R arises from collisions of the conduction electrons with the positive ion cores.
D)	Electrical resistance of a conductor R is proportional to the electrical resistivity ρ.
E)	Electrical resistivity ρ of conductors decrease with increase of temperature.

Answer 1

Solution

E) Electrical resistivity of conductors decreases with increase of temperature.

That truth is that electrical resistivity of conductors increases with increase in temperature. All other given statements are true. The resistance is given by,

1. It is inversely proportional to cross sectional area A
2. Directly proportional to resistivity
3. It arises due to collision of conducting electrons.
4. And since resistivity increases with temperature resistance R also increases with temperature.