Question

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

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

Answer 1

    ---Where the R is the resistance, l is the length of the conductor, and a is the cross-sectional area of the conductor.

The false statements are B and E. ---> Electrical resistance R of a conductor increases with temperature. Since with increasing temperature the collision between the conduction electron and the positive ion core increases so the resistance also increases, does not decrease. The reasoning is the same for B also since R is proportional to .