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Two small plastic balls with mass m, and 0. 7g hang from threads of negligible mass, as shown in
Figure
Each ball has a charge of magnitude q, and 67 nC. The balls repel one another. The threads attached
to the balls make an angle of 20° and 30° respectively with the vertical.
a) Find mass mị and charge q1
b) Find the tension in each of the threads.
/20°'30
91
67nC
m1
+ 0.7 g
3.5 ст

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