# DQ4C_solution - Discussion Question 4C P212 Week 4 Electric...

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Discussion Question 4C P212, Week 4 Electric Potential due to a System of Point Charges Three point charges are fixed at the positions shown in the figure. We are interested in the electric potential surrounding this system of charges . .. we'll set the potential at infinity to be zero in all of these problems. Also, we'll work with algebraic answers in this problem, so you can put your calculator away. (a) What is the electric potential at the origin? (i) It is always a good idea to anticipate as much of the answer as possible before you begin your calculations. In potential problems, the sign is particularly important. So, using only your physical intuition, what will be the sign of the electric potential at the origin? (Ask yourself: if I bring in a positive charge from infinity, where the potential is set to zero, will I be pushing it ‘uphill’ or letting it roll ‘downhill’?) (ii) Now we’re ready to calculate. You could do this problem like the last one, using integrals over the electric field.

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DQ4C_solution - Discussion Question 4C P212 Week 4 Electric...

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