# A small 2-05-g plastic ball that has a charge q of 1-75 C is suspended.docx

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A small 2.05-g plastic ball that has a charge q of 1.75 C is suspended by a string that has a length L of 1.00 m in a uniform electric field, as shown in the figure. If the ball is in equilibrium when the string makes a 9.80 Solution Balancing vertical forces, Tcos?=mg Balancing horizontal forces, qE=TSin? Dividing both equations, Tan ?=qE/mg q=mgTan?/E=0.0025*9.81*Tan 15.5/1000=6.80?C .

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### A small 2-05-g plastic ball that has a charge q of 1-75 C is suspended.docx

• 1. A small 2.05-g plastic ball that has a charge q of 1.75 C is suspended by a string that has a length L of 1.00 m in a uniform electric field, as shown in the figure. If the ball is in equilibrium when the string makes a 9.80 Solution Balancing vertical forces, Tcos?=mg Balancing horizontal forces, qE=TSin? Dividing both equations, Tan ?=qE/mg q=mgTan?/E=0.0025*9.81*Tan 15.5/1000=6.80?C
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