Instructions:

Solve the problems by showing all the steps

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1. Electric Potential Energy:

Find the ratio of speeds of an electron and a negative hydrogen ion (two electrons in it.) accelerated through the same voltage, assuming non-relativistic final speeds. The mass of the hydrogen ion is 1.67 x 10^-27 kg and the mass of an electron is 9.1 x 10^-31 kg.

2.) Electrical Potential:

Charges of 10mC, -20mC, and 10mC are placed on the three corners A, B, C respectively of a square ABCD. Calculate the net potential at D.