answer is b force is non conservative

 

if my answer is correct then the explanation is as follows

 

choose two points A(x1i+y1j+z1k)  and b(x2i+ y2j+ z2k)

 

sum the work done over the two diff paths i.e f.OA + f.AB 

u will find that it is not equal to f.OB

so the force is non conservative

 

also to your first question u require a point through which the line passes

otherwise u cannot solve the qn

 

plz reply indicating if my answer is right or not