Most Important Selected Qs for JEE AdvancedPhysicsCurrent Electricity
The wire A B of a meter bridge changes linearly from radius r to 2 r from left end to right end. Length of wire is 1 m . Where should the free end of the galvanometer be connected on A B so that the deflection in the galvanometer is zero?
Options
- A2 3 ~m from end B
- B1 3 ~m from end A
- C1 4 ~m from end A
- D3 4 ~m from end B
Correct answer
B. 1 3 ~m from end A
Step-by-step solution
aligned & R = ₀^ x dx ( r + rx )^2 = r ^2 & Now R ₁= ₀^ ₁ x dx ( r + rx )^2 = r ^2 [ 1 (1+ ₁ ) -1 ] & 1 1+ ₁ = 3 4 aligned