The electric field direction is defined by the direction of the force felt by

By a positive charge

Explanation:

The electric field is a vector consisting of a magnitude and a direction.

- The magnitude of the field depends on the configuration of the field: for example, for the electric field produced by a single point charge, it is

where k is the Coulomb's constant, q is the magnitude of the charge, r is the distance from the charge.

- The direction of the field corresponds to the force that a positive charge would feel in that field. For example, the electric field produced by a single-point positive charge points away from the charge itself: this is because a positive test charge placed in this field would feel a repulsive force, so it  would move away from the source of the field. Vice-versa, the electric field produced by a single-point negative charge points towards the charge itself: this is because a positive test charge placed in this field would feel an attractive force, so it  would move towards the source of the field.

a.) is the correct answer.

explanation:

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