Acounterclockwise current runs through a square wire loop in the xy plane centered at the origin. the length of each side is d. what is the magnetic field on the z axis?

Explanation:

Magnetic field due to straight current carrying wire is given by the formula

now we will have for one side of the square at its center position given as

now for the we have for complete square loop it will become 4 times of the one side

no sign of dia of fuel cell

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