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Question 8 A sphere of mass m 6.12 kg and net positive charge +30 mC is hung on a string and then placed in an external electric field that points upward, as shown in the figure below. The tension in the string is measured to be 45 N What is the magnitude of the external electric field?

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Answer #1

force acting on the ball

1) electric force

2) tension

3) weight

T + qE = mg

45 + 0.03*E = 6.12*9.8

E = 499.2 N/C

so the value of electric field is 499.2N/C

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