An electron is moving horizontally in a laboratory when a uniform electric field is suddenly turned on. this field points vertically upward. which of the paths shown will the electron follow, assuming that gravity can be neglected?

Explanation:

We know that electron always tends to travel in the direction opposite the direction of electric field ( force in directed opposite to the field on electron).

So, since the field points vertically upward , it force the electron move downward. So, the electron will be accelerated in downward in the right direction.

f=ma newton

f=100x2.5=250n