Question

5. What correctly relates the concept of resistivity to resistance?

A) Increase in density means an increase in resistivity causing an increase in resistance

B) Decrease in temperature means an increase in resistivity causing an increase in resistance

C) Decrease in density means an increase in resistivity causing an increase in resistance

D) Increase in temperature means an increase in resistivity causing an increase in resistance

5.1 What would have an effect on the resistance of a conducting wire?

E) The emf of the battery to which the resistor is connected

F) The current passing the through the conductor

G) The manner in which it is connected to other resistors

H) The material from which the wire is made.

Answer 1

The answer for 5 is D).

The answer for 5.1 is H)

Explanation:

It does not depend on density of a material so, if we have two wires made from the same metal but manufactured to have different densities the never though the density are different the resistively of both the wires would be be the same as they are made from the same metal when a conductor is heated the particles/atoms this a thermal agitation makes it more difficult for free electrons to pass through it so, this thermal agitation increases the resistivity of the metal making it difficult for the current to flow through it the general relation is s(T) = s(t_0)[1 - alpha(T - T_0)] where t_0 is a known Temperature at which we also known as the resistivity of the material s(t_0) and alpha is the Temperature coefficient resistivity xs(T) = positivity at Temperature T \r\n The resistance of a conductor is given by R = s.l/A where s = resistivity of the material L = length of the conductor