AP EAMCET202120 Aug 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual
A wire of length L m carrying a current I A is bent in the form of a circle. Magnitude of its magnetic moment is
Options
- AL 2 I 2 4 π
- BL 2 I 4 π
- CL I 4 π
- DL I 2 4 π
Correct answer
B. L 2 I 4 π
Step-by-step solution
The magnetic moment of a current loop can be defined as the product of the current flowing in the loop and the area of the circular loop, M = I A When a wire is bent to form a circular loop then its area is A = π L 2 π 2 Therefore, magnitude of its magnetic moment is M = L 2 I 4 π