Two large oppositely and uniformly charged parallel plates are separated by 10mm. An electron is projected haldway between the plates and parallel to them with an initial speed of 4.2×10^6 m/s. The...

Two large oppositely and uniformly charged parallel plates are separated by 10mm. An electron is projected haldway between the plates and parallel to them with an initial speed of 4.2×10^6 m/s. The electron hits the top plate 20mm from where the electron was projected