Table of Contents
What is stretched wire?
In stretching a wire work is done against internal restoring forces. This work is stored as elastic potential energy or strain energy. If a force F acts along the length L of the wire or cross section A and stretches it by x then: Young′sModulus(Y)=StressStrain=F/Ax/L=FLAx⇒F=YALx.
What happens if the length of a wire increases?
When the length of wire is longer, the current has to travel more distance and face more obstacles. With the length, resistance increases. The space of the elctrons to travel increases when cross sectional area is increased.
What happens to the resistivity of a wire if it is stretched * A it will increase B it will decrease C first increases then decreases D remains the same?
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.
Why work is required to be done to stretch a wire?
When a wire is stretched, the internal reactive force kicks in and fights the stretch. As a result, work is being done to overcome this opposing force. The wire stores this work in the form of elastic potential energy.
Why work is said to be done in stretching a wire?
When we stretch a wire, the work has been done against interomic forces. This work is stored in the wire in the form of elastic potential energy.
How does length of a wire affect its electrical resistance?
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 .
What change in resistance and resistivity will happen is wire if doubled by stretching it?
Complete step-by-step answer: (d) Resistivity of wire remains constant. As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.
Which type of stress is involved in stretching a wire?
Stress is generally defined as force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, we call such stress a tensile stress.
What happens to the resistance of a wire when it is stretched?
Resistance of a wire is directly proportional to length and inversely proportional to cross sectional area . So whenever a wire is stretched its length increases and cross sectional area decrease .According to above proportionally the resistance of wire will increase .
What happens when a conductor is stretched to double its length?
However, if a conductor ( say copper, because that’s what I know about) is stretched to double its length, the metal will harden from the process of diameter reduction and lengthening. This is, in fact, the process for making wire…. the diameter is reduced while the wire is pulled and stretched through a steel or diamond drawing die.
What happens when you increase the length of a wire?
When the wire is short, the electric field is more concentrated and hence stronger. If the wire is doubled in length, the electric field gets more dilute and reduces to half its strength. This is why increasing the length of wire, reduces the speed of the charges and hence translates to increasing the resistance of the wire.
What is the process of making a wire?
This is, in fact, the process for making wire…. the diameter is reduced while the wire is pulled and stretched through a steel or diamond drawing die. Soft copper, typically used for electrical conductors work hardens quickly while the electrical conductivity decreases (or resistivity increases).
https://www.youtube.com/watch?v=EJf17eUuww4