JEE Main20246 Apr 2024Morning ShiftPhysicsMagnetic Effects of CurrentActual
A circular coil having 200 turns, 2.5 10⁻⁴ ~m ^2 area and carrying 100 A current is placed in a uniform magnetic field of 1T. Initially the magnetic dipole moment ( M ) was directed along B . Amount of work, required to rotate the coil through 90^ from its initial orientation such that M becomes perpendicular to B , is ______ J .
Correct answer
0
Step-by-step solution
We know aligned W _ ext & = U + KE ( P.E. =- M B ) & =- M B _ f + M B _ i +0 & =- MB 90+ MB 0 & = MB & = NIAB & =200 100 10⁻⁶ 5 2 10⁻⁴ 1=5 J aligned