if a wire of resistivity is streched to thrice its initial length what will be its new resistivity.
To determine the new resistivity of a wire when it is stretched to thrice its original length, we need to consider the relationship between resistivity, length, and cross-sectional area.
The formula to calculate the resistance of a wire is given by:
R = (ρ * L) / A
Where:
R is the resistance of the wire,
ρ (rho) is the resistivity of the wire material,
L is the length of the wire,
A is the cross-sectional area of the wire.
Now, let's analyze the situation. We know that the wire's resistivity (ρ) is constant. We also know that the wire's length (L) is stretched to thrice its initial length (3L). However, we have no information about the change in the cross-sectional area (A).
Since we don't have enough information about the change in the cross-sectional area, we cannot determine the exact new resistivity. The resistivity remains the same, but the resistance of the wire will change due to the change in length.