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m =1 gm
The pith ball shown below has a mass of 1 gram and a charge of -3nC.
y
Q= -3 nC
When aelectric field, E, is turned on the pith ball moves into equilibrium as
shown below. The tension in the string is 10mN at 30° to the horizontal.
2. Find the magnitude and direction of the E field (15 points)
T= 10mN

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