Which of the following statements are true? a) the resistance of a conductor is proportional to the conductivity of the material of which the conductor is composed. b) the resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed. c) a material that obeys ohm's law reasonably well is called an ohmic conductor or a linear conductor. d) good conductors of electricity have larger conductivity values than insulators. e) semiconductors have resistivity values that are larger than those of insulators.

The following statements are true

B) The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed.

C) A material that obeys Ohm's law reasonably well is called an ohmic conductor or a linear conductor.

D) Good conductors of electricity have larger conductivity values than insulators.

Explanation:

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27