AP EAMCET202420 May 2024Evening ShiftPhysicsMagnetic Effects of CurrentActual
Two concentric thin circular rings of radii 50 cm and 40 cm , each carry a current of 3.5 A in opposite directions. If the two rings are coplanar, the net magnetic. field due to the two rings at their centre is
Options
- A11 10⁻⁷ ~T
- B22 10⁻⁷ ~T
- C17 10⁻⁷ ~T
- D8 10⁻⁷ ~T
Correct answer
A. 11 10⁻⁷ ~T
Step-by-step solution
r ₁=40 ~cm , r ₂=50 ~cm , I =3.5 ~A The magnitude of magnetic field at the centre O of ring, aligned & B= ₀ I 2 ( 1 r₁ - 1 r₂ ) & = 4 10⁻⁷ 3.5 2 ( 1 40 - 1 50 ) 10^2 & =10.99 10⁻⁷ 11 10⁻⁷ ~T aligned