When a surfer rides an ocean wave on her surfboard, she is actually riding on
a. a crest that is toppling over.
b. a trough of the wave.
c. the rest position of the wave.
d. a region of rarefaction.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach