AP EAMCET202316 May 2023Evening ShiftPhysicsMagnetic Effects of CurrentActual
The magnitude of the axial field due to a short bar magnet at a distance of 50 ~cm from its mid-point is (The magnetic moment of the bar magnet is 0.4 Am ^2 )
Options
- A3.2 10⁻⁷ ~T
- B1.6 10⁻⁷ ~T
- C6.4 10⁻⁷ ~T
- D4.8 10⁻⁷ ~T
Correct answer
C. 6.4 10⁻⁷ ~T
Step-by-step solution
Magnetic moment, m =0.4 Am ^2 Distance, r =50 ~cm =0.5 ~m The magnitude of the axial field aligned & Baxial = ₀ 4 ( 2 ~m r ^3 ) & = (10⁻⁷ ) 2 0.4 (0.5)^3 =6.4 10⁻⁷ ~T aligned