Lect13_new.pptx.pdf

# It is found that pithballs 1 and 2 aoract each other

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charged by touching them with one of these objects. It is found that pithballs 1 and 2 aOract each other and that pithballs 2 and 3 repel each other . From this we can conclude that A. 1 and 3 carry charges of opposite sign. B. 1 and 3 carry charges of equal sign. C. All three carry the charges of the same sign. D. One of the objects carries no charge. E. We need to do more experiments to determine the sign of the charges. Three idenPcal charges are lined up in a row. Sketch the free body diagram for q3. Draw the forces to scale. (Consider only the electric forces.) Next, write down the total vector force acPng on q3.

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10/3/17 2 Foothold ideas: Electric Forces and Fields When we focus our attention on the electric force on a particular charge (a test charge) we see the force it feels factors into the magnitude of its charge times a factor that depends on position (and the other charges). Foothold ideas: Fields A field is a concept we use to describe anything that varies in space. It is a set of values assigned to each point in space (e.g., temperature or wind speed). A force field is an idea we use for non-touching forces . It puts a force vector at each point in space, summarizing the effect of all objects that would exert a force on a particular object placed at that point.
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• Spring '16
• Pritchie
• Charge, Force, Electric charge, Biology 23300

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