defence exam Army Havildar SAC Mock Test Series 2025 Physics Electromagnetic Oscillations and Alternating Current Power in Alternating-Current Circuits
The resistance of a wire of length l and area of cross-section a is × ohm. If the wire is stretched to double its length, its resistance would become
1
2 × ohm
2
0.5 × ohm
3
4 × ohm
4
6 × ohm