?a wire is stretched 30% what is the percentage change in resistance

The percentage change in resistance of the wire is 69%.

Explanation:

Resistance of a wire can be determined by,

R = (ρl) ÷ A

Where R is its resistance, l is the length of the wire, A its cross sectional area and ρ its resistivity.

When the wire is stretched, its length and area changes but its volume and resistivity remains constant.

= 1.3l, and =

So that;

= (ρ) ÷ = (ρ × 1.3l) ÷ ()

    = (1.3lρ) ÷ ()

    = × [(ρl) ÷ A]

   = 1.69R               (∵ R = (ρl) ÷ A)

= 1.69R

Where is the new resistance, is the new length, and is the new area after stretching the wire.

The change in resistance of the wire = - R

                                      = 1.69R  - 1R

                                      = 0.69R

The percentage change in resistance = × 100

                                                               = 0.69 × 100

                                                              = 69%

The percentage change in resistance of the wire is 69%.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card