Question

2. Resistance of conductor increases if_
i) Length increases ii) area increases ii) length decreases iv) area decreases
a) (i) & (ii) b) (ii) & (iii) c) (ii) & (iv) d) (i) & (iv)​

Answer 1

Answer:

Answer is d

Explanation:

Resistance of a conductor depends on:

            Length of a conductor. Resistance of a conductor is directly proportional to the length of a conductor. If length increases resistance will also increase.

          Area of cross section of a conductor. The resistance of a conductor is inversely proportional to the area of the cross section of a conductor.

Answer 2

Explanation:

ANSWER

Resistance of a conductor increases if the Length increases AND area decreases.

Why?

We know the formula that

Resistance = Rho× Length/ Area.

Here Rho is Resistivity AND IT taken as an constant to equalise the Equation.

It is also known AS Resistivity.

So we can see that Length os in numerator so it is directly proportional and taking Resistivity as Rho constant Area is in denominator and hence is inversely proportional.

So d) part is the correct answer.