Q. A 5 ? resistance wire is doubled on it. Calculate the new resistance of the wire ?
✅ Correct Answer: (A)
1.25 ?
Explanation: Resistance (R) = 5 ? The Resistance of wire = R = p L / A When the wire is doubled, its length becomes half, and the area of cross-section is doubled = R = p L / A = p L/2 / 2A = 1/4 p L / A = = 1.25 ? New Resistance
Explanation by: Vijay Sangwan
Resistance (R) = 5 ? The Resistance of wire = R = p L / A When the wire is doubled, its length becomes half, and the area of cross-section is doubled = R = p L / A = p L/2 / 2A = 1/4 p L / A = = 1.25 ? New Resistance