Fun with Fields

A Proton is accelerated from rest by a potential difference V = 420. The proton then enters a magnetic field as shown in the diagram:

The proton leaves the region from the side BC. Determine the magnitude of the electric field strength that would produce a force on a proton that is equal to the force due to the magnetic field that acts on the proton while the proton is in the region ABCD.

7.8 1 0 4 7.8 * 10^4 8.7 1 0 4 8.7 * 10^4 5.6 1 0 2 5.6 * 10^2 4.3 1 0 3 4.3*10^3

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