Electric Forces and Electric Fields29The period of the pendulum will be 20.500 m220.307 s""210 m sLTgππ===(b) Y. The force of gravity is a significant portion of the total downward force acting on the ball. Without gravity, the effective acceleration would be es2-30.200 N“”200 m s1.0010kgeFgm===×giving 20.500 m20.31200 m sTπ==4 s a 2.28% difference from the correct value with gravity included. 15.57The sketch at the right gives a free-body diagram of the positively charged sphere. Here, 221eFkqr=is the attractive force exerted by the negatively charged sphere and
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