MHT CET202019 Oct 2020Evening ShiftPhysicsMagnetic Effects of CurrentActual
A steel wire of length ' ' has a magnetic moment 'M'. It is then bent into a semicircular arc. The new magnetic moment is
Options
- A2 M /
- BM
- CM
- DM /
Correct answer
A. 2 M /
Step-by-step solution
(C) When wire is bent in the form of semicircular arc then, l = r The radius of semicircular arc, r =1 / Distance between two end points of semicircular wire =2 r = 21 Magnetic moment of semicircular wire =m 2 r=m 2 l = 2 m l But ml is the magnetic moment of straight wire i.e., ml = M New magnetic moment = 2 M