Q. An insulating ring of radius 1 m, mass 1 kg, heat capacity 1 J/k carrying a uniformly distributed charge of 1 c is lying on a smooth horizontal plane. Magnetic field induction ${10}^4$ T present in a direction perpendicular to the plane changes at the rate of 1 J/sec. Simultaneously heat is supplied to the ring at the rate of 1 J/sec
Coefficient of linear expansion of the material of ring is ${10}^{-4}$ per k. The instanious maximum angular 
acceleration of the ring is 

1. 1 rad/$s^2$
2. 1.5 rad/$s^2$
3. 2.5 rad/$s^2$
4. 3 rad/$s^2$