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.

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.