A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge.The force exerted by the wedge on the block ( g is acceleration due to gravity) will be

A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge.The force exerted by the wedge on the block ( g is acceleration due to gravity) will be [2004]

NEET 2004 

(a) mg/ cos θ

(b) mg cos θ

(c) mg sin θ

(d) mg