What is the strain when wire is stretched to double its length?

If a wire is stretched to double of its original length, then the strain in the wire is. Strain =2l2=2 Ans.

When a wire is stretched to double its length Its radius is halved?

If length is doubled and radius is halved the resistance would increase by 8 times. Since R = P* L/A: since resistivity is constant, Length becomes 2L and area becomes 1/4 th. Therefore it is 8 times.

When a wire is stretched to three times Find strain?

Answer: When the wire is stretched to 3 times its original length, its cross section is also reduced to one third of what it was before. By using the above relation, we find the new resistance to be 3×3= 9 times of what it was before!

What happens to the resistivity of a wire if it is stretched to double its initial length?

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.

What happens when the radius of a wire is doubled?

(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.

When a wire is stretched to three times of its length its resistance becomes 9 times True or false?

Assertion : When a wire is stretched to three times its length, its resistance becomes 9 times. Reason: Resistance is directly proportional to length of wire.

What happens to resistivity of a wire if it is stretched?

Resistivity of a material does not change with dimensions. It depends on material and temperature. Hence, by stretching a wire, there will be no effect on its resistivity. It will remain same.

What will be the resistance R of a wire when its radius is halved and length is reduced to one-fourth of its original length a 4r b/r 4 C R D 2R?

Implies, there is no change in resistance when radius is halved and length is reduced to one-fourth of it’s original length.

Is it possible to stretch a wire to double its length?

With a metal wire, if you were able to stretch it to double its length without breaking, it would only do so by plastic flow. This is a permanent deformation, and when the stress is removed the wire would remain at approximately twice its former length.

What is the resistance of a stretched wire in stretched condition?

Doubling L of course doubles the wire’s (end-end) resistance, so the resistance of the wire in its stretched condition (Rs) becomes:: Thus the end-end resistance will increase by a factor of four, while the resistivity (ρ) will remain constant.

What is the unit of change in length of a wire?

Longitudinal Strain is ratio of change in length to original length. Wire is stretched to double it’s original length. Hence change in length = 2×L – L (where L is original length. ) Therefore change in length is L. Stain dont have any unit.

How can a wire stand 100\% strain without breaking?

Practically no engineering material, and certainly not a wire, can stand 100\% strain without breaking. Most metals can barely withstand 1\%. Only with something like a rubber band is it reasonable to regard 100\% extension as a strain. With a metal wire, if y Strain, in engineering terms, is the ratio of extension under load to length under no load.