Physics!! Help!!!!!

A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched.
Express your answer in terms of the wire's original resistance R.

  1. 👍
  2. 👎
  3. 👁
  1. The product L*A remains constant after stretching. If L doubles, A decreases by 1/2

    Resistance is proportional to L/A.

    R2/R1 = L2/L1 *A1/A2 = 4

    R1 is the original resistance and R2 is the final resistance.

    1. 👍
    2. 👎
  2. A)becomes double B)remains same C)becomes half C)becomes square

    1. 👍
    2. 👎
  3. Remain same

    1. 👍
    2. 👎
  4. Consider a c-Si solar cell whose fingers have a resistance R=0.1 Ohm. What would be the finger's resistance (in Ohm) if the finger's width is doubled and the finger's height is one third of its initial value?

    1. 👍
    2. 👎
  5. (It's very urgent, therefore we kindly ask you to forward this email to your CEO. Thanks)

    Dear CEO,

    This email is from China domain name registration center, which mainly deal with the domain name registration in China. On 20-08-2020, we received an application from Hongxin Ltd requested "jiskha" as their internet keyword and China (CN) domain names (,,, But after checking it, we find this name conflict with your company name or trademark. In order to deal with this matter better, it's necessary to send this message to your company and confirm whether this company is your distributor or business partner in China?

    Best Regards
    Oliver Liu | Service & Operations Manager
    China Registry (Head Office)
    Tel: +86-02161918696
    Fax: +86-02161918697
    Mob: +86-13816428671
    6012, Xingdi Building, No. 1698 Yishan Road, Shanghai 201103, China

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    If the current in a wire of a CD player is 5.00 mA, how long would it take for 2.00 C of charge to pass through a cross-sectional area of this wire?

  2. physics

    Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare? CHECK ALL THAT APPLY Wire A and wire B have the same resistance.

  3. physics

    The filament in an incandescent light bulb is made from tungsten (resistivity 5.6 x 10-8 Ù·m). The light bulb is plugged into a 120-V outlet and draws a current of 2.36 A. If the radius of the tungsten wire is 0.00464 mm, how

  4. Physics

    9. Figure shows an aluminium wire of length 60 cm joined to a steel wire of length 80 cm and stretched between two fixed supports. The tension produced is 40 N. The cross-sectional area of the steei wire is 1.0 mm2 and that of the

  1. physics

    A wire of length 100cm and cross-sectional area 2.0*10-3cm2 has a resistance of 0.1 ohms. calculate it's electrical conductivity?

  2. Physics

    If a wire has a resistance, 1.32ohms,the length of 110cm,and an area of cross sectional of 0.00415cm,find the resistivity of the material of which it is made?

  3. physics

    If a metal wire carries a current of 130 mA, how long does it take for 3.50×10 20 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude of the charge on an electron is 1.6 × 10 −19 C. Answer in

  4. physics

    a wire whose cross-sectional area is 4mm^2 is stretched by 0.1 mm by a certain load.if a similar wire double the area of cross-section is under the same load,then then elongation would be ans: 1)0.05mm

  1. physics

    A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 . electrons I got 9.3e+22 for B but its

  2. physics/electrical circuits

    a wire has a resistance of 1 ohm if the length is increased four times and the area is double the original, find the new resistance of the wire.

  3. Math

    The electrical resistance of a wire waves directly as its length & inversely as the square of its diameter if a wire 30m long and 0.75mm in diameter has a resistance of 25ohms , find the length of a wire of the same material whose

  4. College Physics

    A wire P has resistance R. If the wire is stretched and its length is increased by 10%, what would be the percentage change in its resistance? (Assume the density of the wire remains constant) A) - 10% B) 0 % C) 10% D) 20% My

You can view more similar questions or ask a new question.