Question

A student carried out an experiment and plot V-I graph of a conductor A,B,Cof Shimla parameters which of the three will have the highest and lowest resistivity??​

Answer 1

Answer:

Resitivity of C > Resitivity of B > Resitivity of A

Explanation:

In order to understand the question fully, first see the attached figure showing graph of resistnance of A, B and C.

Since the slope of the above graph is inversely proportional to the resistance. As in the graph, slope of A is maximum, so resistance will be minimum. Similarly Slope of C is minimum, so it will have maximum resistance. So, the correct order is:

Rc > Rb>Ra

Since resistance is directly proportional to resisitivity provided lenth and area of each conductor is same and constant;

Resitivity of C > Resitivity of B > Resitivity of A

Answer 2

Answer:

$V=IR so, R=\frac{V}{I}$

Explanation:

So, the slope of the V I graph gives the resistance. Their resistors are given of the same material. Since the slip of A > B > C, hence the resistance is maximum for A followed by B, followed by C.

Now, resistivity depends only on the material of the wire and the temperature, but the wires are made up of the same material. Hence, the resistance of all three wires is equal.