Physics 12

Name: ___________________________

Electric Field from Multiple Charges We have already seen how charged particles emit electric fields, but how do these fields interact when two or more charges act on each other? Consider two positively charged particles:

Now, two negatively charged particles:

Note that the electric field lines point _________ _____________ _______________. Because this electric field is a force field, it is a vector. So when multiple fields overlap we simply ____________ OK, now try two opposite charges:

Again the two fields interact, only this time they_________________________ Example: What is the strength of an electric field midway between a 2.00 uC charge and a -4.00 uC that are 0.60 m apart?

Example: Two 5.25 uC charges are 0.40 m apart. What is the strength of the electric field between them at a point 0.10 m away from the first charge and 0.30 m away from the second?

Physics 12

Name: ___________________________

Example: Find the magnitude and direction of the electric field at the point P due to the charges as shown.

12. 0

6.0 m P

4.5 m

8.0

Suppose that a proton was placed at point P. What would its initial acceleration be?

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