NEET2020PhysicsCurrent ElectricityActual
A resistance wire connected in the left gap of a metre bridge balances a 10   Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2 . If the length of the resistance wire is 1.5   m , then the length of 1   Ω of the resistance wire is:
Options
- A1.0 × 10 − 1   m
- B1.5 × 10 − 1   m
- C1.5 × 10 − 2   m
- D1.0 × 10 − 2   m
Correct answer
A. 1.0 × 10 − 1   m
Step-by-step solution
R 10 = l 1 l 2 R 10 = 3 2 R = 15   Ω Length of 15 Ω resistance wire is 1 . 5   m ∴ length of 1 Ω resistance wire = 1 . 5 15 = 0 . 1 = 1 . 0 × 10 − 1   m