CUET Preparation Today
If the length of a wire is doubled while keeping its material and cross-sectional area same, the resistance of the wire |
becomes double of its initial value becomes half of its initial value becomes four times of its initial value remains same |
becomes double of its initial value |
The correct answer is Option (1) → becomes double of its initial value Resistance of a wire is given by: $R = \rho \frac{L}{A}$ If length $L$ is doubled and $\rho, A$ remain the same: $R_\text{new} = \rho \frac{2L}{A} = 2 \cdot R_\text{initial}$ Resistance becomes double of its initial value |
