A body is kept on a rough horizontal surface of angle of friction ' `alpha` ' and moved by applying a force of magnitude 'F' making angle `theta` with horizontal. Arrange the following cases in the order of increasing magnitude for F.
i) F is pulling force and `theta= alpha`
ii) F is pulling force and `theta =0`
iii) F is pulling force and `alpha = theta =0`
iv) F is pushing force and `theta = alpha`

Options

A. iv,iii,iiand i
B. I,ii,iii and iv
C. I,ii,iv and iii
D. iii,I ,ii and iv

Answer

D