AP EAMCET2007PhysicsMagnetic Effects of Current
A bar magnet of magnetic moment M and moment of inertia I is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle ( ) , the angular acceleration is (Magnetic induction of earth's horizontal field =B_H )
Options
- AM B_H I
- BI B_H M
- CM I B_H
- DI M B_H
Correct answer
A. M B_H I
Step-by-step solution
When magnet is displaced by a very small angle , then restoring couple acting on the magnet is =-M B_H Negative sign shows the restoring nature of torque. Now since =I and for small angular displacement I =M B_H or aligned & = angular acceleration & = M B_H I aligned