Apositive charge is moved from point a to point b along an equipotential surface. how much work is performed or required in moving the charge?

answer: good job it's all correct !

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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