A wire has a resistance of 8 ohms. If it is stretched to twice its length, what is its new resistance?
Q1. A wire has a resistance of 8 ohms. If it is stretched to twice its length, what is its new resistance?
Answer: 32 ohm
Explanation: When a wire is stretched to twice its length, its resistance becomes four times, so R_new = 8 * 4 = 32 ohm. Option A is incorrect because it doesn't account for the change in cross-sectional area.