Q 1417834780.     A plumb bob is hung from the ceiling of a train
compartment. The train moves on an inclined track of inclination `30°` with horizontal. 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

A

`30° `

B

`tan^(-1) (2/sqrt3)`

C

`tan^(-1) (sqrt3/2)`

D

`tan^(-1)(2)`

HINT

Drawing free body diagram of bob Let `m` be the mass of the bob. Then, `sum F_y = 0`

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