When Length Of Wire Is Doubled What Is The Change In Resistance?

How will the resistance of a conductor change if it is stretched so that its length is doubled?

When the wire is stretched to double the length , the area of cross section gets reduced to half.

So when the wire is stretched, the resistance multiplies by four times..

What happens to the resistance of the material if its length is doubled and area is reduced by half?

Doubling the area (A) decreases (halves) the resistance. Halving the area increases (doubles) the resistance.

What happens to area when length is doubled?

So, now if you increase the length of wire by 2 times it’s cross-sectional area will decrease by 2 times, because the volume of the wire has to remain constant. … Originally Answered: A wire is stretched double its length.

Does the length of a wire affect resistance?

(1) Length: the length of the wire will affect the resistance. The longer the wire, the higher the resistance. … The thicker the wire, the lower the resistance. (3) Material: the material the wire is made out of will affect the resistance.

What happens to resistance if radius is doubled?

Here, Resistance of a wire is inverself proportional to the area of cross-section. So, when we double the radius, it will increase the cross-section of the wire four-times. When radius is doubled, Resistance decreased 2² times which is 4.

What happens to the resistance of a conductor when the length is reduced to half?

Since resistance is directly proportional to the length of the conductor, hence, in this case the resistance will decrease to half.

What is the SI unit of resistivity?

The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m). It is commonly represented by the Greek letter ρ, rho. Although the SI resistivity unit, the ohms metre is generally used, sometimes figures will be seen described in terms of ohms centimetres, Ω⋅cm.

How does the resistance of wire change when its length is increased by 20?

The resistance of a wire is directly proportional to its length… We Know about that Resistance= Risistivity×length/area. … If area is increase by 20% then Resistance decrease by 20% due to Resistance is inversely proportional to area.

Is doubled by what factor does the resistance change?

Resistance is directly proportional to l while inversely proportional to A. So , when length of wire will be doubled resistance will also become four times .

How does the resistance of wire change when 1 Its length is doubled 2 area is doubled?

How will the resistance of a wire change when : Its length is doubled. Resistance of wire is proportional to length and inversely proportional to area. … Resistance of wire increases by four times.

When length of a wire is doubled What is the change in resistivity?

The Resistivity of the wire will not change with the change in length. Resistivity is a property of the wire, it doesn’t depend upon it’s length or cross-sectional area. However, If you are asking about Resistance, it will increase to 4 times it’s initial value.

When the length of the conductor is doubled then its resistance will be?

If the length is double then the resistance would increase by 8 times. Since R=P*L/A (Resistivity constant) length becomes 2L and area becomes 1/4th. So, almost the new resistance increase by 4 times.

On what factors resistivity depends?

The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The unit for resistivity is the ohm-metre. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.

How does resistance change with length of wire?

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional . … The relationship between resistance and the area of the cross section of a wire is inversely proportional .

How is the resistance of a wire affected if its length is doubled its radius is doubled?

=) Here, Resistance of a wire is inverself proportional to the area of cross-section. So, when we double the radius, it will increase the cross-section of the wire four-times. When radius is doubled, Resistance decreased 2² times which is 4.