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Part a In cases A and B shown in Figure 3 there are two positive point charges +Q each a distance s away from a third positive point charge +q Is the net electric force on the +q charge in case A greater than, less than, or equal to the net electric force on the +q charge in case B? Explain.

Case A Case B Figure 3 Part b In case C, two positive point charges +2Q are each a distance s away from a third positive point charge +q. In case D, four positive point charges +Q are each a distance s away from a fifth positive point charge +q, as seen in Figure 4. (The angle α shown is the same in both cases.) Is the net electric force on the +q charge in case C greater than, less than, or equal to the net electric force on the +q charge in case D? Explain. +Q/10 +20 (t Case C Case D Case E Case F Figure 4 Figure 5

Part c In case E a positive point charge with +Q is a distance s away fro a second positive point charge . In case F ten positive point charges, each with charge +/10, lie along an arc of radius s centered on a positive point charge +q, as shown in Figure 5 Is the net electric force on the +q charge in case E greater than, less than, or equal to the net electric force on the +q charge in case F? Explain

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Esins Esin 0 htE cosa 자 En2 E 2E cos 오E nd

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