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EP: Electric Potential
Introductory Physics

Electric Potential and Potential Energy

Electric Potential Field Patterns and Motion of Charges

Combined conservation of energy and electric potential practice problem

Proton-beam therapy involves firing high-energy protons at a tumor. The protons burrow into the tumor, coming to rest. The kinetic energy lost by the protons goes into the tumor, bursting its DNA, thus killing its cells. In one case, 0.1 Joules of proton energy is desired to be deposited in a tumor. The protons are accelerated from rest through a 10 Mega Volts potential difference to create a proton beam. 

Connecting Electric Potential and Electric Field