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A small 8.26 g plastic ball is suspended by a 16.5 cm long string at an...

A small 8.26 g plastic ball is suspended by a 16.5 cm long string at an angle of 21.2 ◦ in a uniform electric field of 1320 N/C.

If the ball is in equilibrium when the string makes a 21.2 ◦ angle with the vertical, what is the net charge on the ball? The acceleration due to gravity is 9.8 m/s 2 , and the Coulomb constant is 8.98755 × 109 N · m2 /C 2 . Answer in units of µC.

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