In a uniform magnetic field, the field lines are parallel, but non-equispaced straight lines.

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

it's a b and

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.