The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

6.67 ohms

60.0 ohms

120 ohms

180.0 ohms

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

In case of stretching of wire R ∝ l2⇒ If length becomes 3 times, resistance becomes 9 timesi.e., R' =9 × 20=180 Ω

Watch 3-min video & get full concept clarity