Two parallel plates X and Y are spaced a distance $d$ apart in a vacuum. A potential difference exists between the plates, creating a uniform electric field. A charge $-q$ starts from rest at the surface of plate X and moves towards plate Y. By the time the charge arrives at plate Y, its kinetic energy is $K$. Which expression gives the electric field strength between the plates?
- A$\dfrac{q}{Kd}$
- B$\dfrac{qd}{K}$
- C$\dfrac{K}{qd}$
- D$\dfrac{Kd}{q}$