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How do you reduce resistivity of a wire length and diameter should be equal or length should be halve or both should be halved or length should b doubled and diameter should be halved or diameter doub?
Wiki User
∙ 12y ago
'Resistivity' is usually considered to be a property of a substance, not a structure.
In the normal unit of resistivity, the length and cross-section area are divided out,
so they don't affect the 'resistivity.
In the case of your piece of wire, the only characteristic that it seems reasonable
to discuss is just plain good old 'resistance'.
I think the point of this question is to investigate the relative effects ... of a change
in length compared to the same change in diameter ... on the initial resistance of a
piece of wire.
Length:
The resistance of the sample is directly proportional to its length.
Diameter:
The resistance of the sample is inversely proportional to the cross-sectional area,
which is the same as saying 'inversely proportional to the square of the diameter'.
So, let's look at the choices listed in the question:
Change length to 1/2:
Resistance changes to 1/2 .
Change length and diameter both to1/2 :
Resistance changes by factor of 1/2 x 4 = 2
Length doubles, diameter 1/2:
Resistance changes by factor of 2 x 4 = 8 times
Length doubled, diameter doubled:
Resistance changes by factor of 2 x 1/4 = 1/2
The first and last choices both reduce the resistance.
The others both increase the resistance.
Wiki User
∙ 12y ago
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What change in resistivity if length is doubled?
Resistivity is a property of a substance, and doesn't depend on the dimensions of a sample. If the length of a conductor is doubled, then its resistance doubles but its resistivity doesn't change.
What happens to the wavelength if the frequency is doubled?
If the frequency is doubled then the wave length and period will be halved because in the same time that the original wave occurred, you will now see 2 waves. .here is NO change in its its speed.
If the length of a spring is halved the stiffness becomes?
If spring is cut into two parts, each spring will have it's stiffness doubled. For n parts, stiffness of each part will be nk
How can you measure resistivity from a graph?
Take measurements of resistances of various lengths of a wire of constant diameter. Make a graph of resistance against length / cross-sectional area of wire. The gradient of the straight line section will be equal to the resistivity of the wire.
What will be the effect of time period of a simple pendulum if its mass is doubled and its amplitude is halved?
The PERIOD of a Simple Pendulum is affected by its LENGTH, and NOT by its Mass or the amplitude of its swing. So, in your case, the Period of the Pendulum's swing would remain UNCHANGED!
How does resistivity vary if length and area are doubled?
if length is doubled then resistivity increases&when area is doubled resistivity decreases.
What change in resistivity if length is doubled?
Resistivity is a property of a substance, and doesn't depend on the dimensions of a sample. If the length of a conductor is doubled, then its resistance doubles but its resistivity doesn't change.
What happens to the resistance when length is doubled n area is quadrupled?
It is halved.It is halved.It is halved.It is halved.
What happens to the volume of a rectangular pyramid if both its length and its height are doubled and its width halved?
The volume is doubled.
What is the Change in resistivity of wire when its resistivity is doubled?
Resistivity of a wire of a certain material is independent of the wire's length. The only thing that would change is resistance. Since R=ρ/A, in the case of length doubling, resistance will also double.Resistance (R, Ω)Resistivity (ρ, Ω m)Length (, m)Cross surface area (A, m²)
What happens to the diameter of a circle if its area is halved?
its diameter is lower by the square root of 2 which is 1414 times smaller
What happens to resistance when length of conductor is doubled without affecting thickness of conductor?
Nothing. Resistivity is a physical characteristic of a material. It's not affected by its shape, etc.
What happens to the wavelength if the frequency is doubled?
If the frequency is doubled then the wave length and period will be halved because in the same time that the original wave occurred, you will now see 2 waves. .here is NO change in its its speed.
When the length and area of cross-section both are doubled then its resistance?
The answer depends on whether the cross sectional radius/diameter are doubles or the cross sectional area is doubled.
When the length and area of cross section both are doubled then its resistance?
The answer depends on whether the cross sectional radius/diameter are doubles or the cross sectional area is doubled.
Does the resistance of a conductor incfrease by any measure when the conductor is in doubled in length?
The resistance is directly proportional to the length of conductor and inversely proportional to area of the cross section.If the length is doubled then the resistance will double.Resistance=rho*l/arho=resistivity of the material (Ohms/m) and depends on the material used for the wirel=length of the wirea= area of the cross section of the wire.
If the length of a spring is halved the stiffness becomes?
If spring is cut into two parts, each spring will have it's stiffness doubled. For n parts, stiffness of each part will be nk
