What happens to the resistivity of wire if it is stretched?
The resistance of a wire is inversely proportional to its area and directly proportional to its length. When the length is tripled then resistance will also become three times. If The wire is stretched 3 times the original length, the cross-section of the wire is cut to 1/3rd it’s the original cross-section.
Why silver is not used for making wires?
Though silver is a very good conductor of electricity but still that is not used in electric wiring primarily due to its cost. It’s very expensive compared to the widely used wiring material copper. Another reason for not using silver is that , it oxidizes easily and tarnishes when it comes in contact with air.
When a thin metal wire is stretched it becomes longer and thinner?
When a thin metal wire is stretched, it becomes longer and thinner. This causes a change in the resistance of the wire. The volume of the wire remains constant.
What happens to the area of cross section if the length is doubled?
Thus, the above equation shows that the length of the conductor and the cross-section of the conductor are doubled, then the resistance of the conductor will remain the same, there is no change in the resistance of the conductor. Hence, the option (A) is the correct answer.
How much does resistivity change if the cross sectional area is doubled?
so if length is doubled resistance will also get doubled i.e resistance is 4 times that of original resistance. now, the resistance of a conductor is inversely proportional the area of cross section. The larger the cross sectional area, the lower the resistance since the electrons have a larger area to flow through.
What will happen if r2 is doubled?
The area will go from 12.56 to 50.24. So when you double the radius, the area goes up by 4 times because 2 squared is 4. The area will always go up by the square of how much the radius goes up.
How does the resistance of a wire change?
First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area.
How does resistance of a wire change?
The resistance of a wire is directly proportional to its length and inversely proportional to its area (or square of inverse of diameter).
How will the resistance of a wire change when its temperature is increased?
With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current. Since conductors typically display an increased resistivity with temperature increase, they have a positive temperature coefficient.