Question

if the length of the conductor increases the resistance become option A increases option B decrease the suction see no changes option d becomes zero​

Answer 1

Given :   the length of the conductor increases the resistance become

To Find : Choose correct option

A increases

B decrease

C no changes  

d becomes zero​

Solution:

R = ρ L/A

ρ = Resistivity of material

L = length

A = cross sectional area

R = Resistance

Hence R ∝ L   if other factors are constant

Hence if  length of the conductor increases the resistance increases

A increases

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Answer 2

Given:

The length of the conductor increases.

To find:

Change in resistance ?

Calculation:

The expression of resistance of a conductor is given as :

$R = \rho \times \dfrac{length}{area}$

• With $\rho$ and area made constant, we can say:

$\implies R \propto \: length$

Since, the length of the conductor is being increased, the net resistance will also increase.

• Please note that in this kind of questions, we are considering the area and material of conductor to be constant.

OPTION A) IS CORRECT !