A plumb bob is hung from the ceiling of a train compartment, The train moves on an inclined track of inclination 30 degree with horizontal. The acceleration of train up the plane is a=g/2. The angle which the string supporting the bob makes with normal to the ceiling in equilibrium is
![](https://sahay.guru/wp-content/uploads/2020/10/Solution-6-4-1024x341.jpg)