In an ideal metre-bridge, the balancing length from the left end when standard resistance of 1Ω is in right gap is found to be 20 cm. The value of unknown resistance (in Ω) is

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

answer is 0.25.

(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

Let unknown resistance be X . Then condition of Wheatstone's bridge gives XR=20r80r, where r is resistance of wire per cm . ∴ X=2080×R=14×1=0.25Ω

Watch 3-min video & get full concept clarity