A 2.1-g plastic sphere is suspended in air appearing to "defy" gravity. This is achieved through...
A 2.1-g plastic sphere is suspended in air appearing to "defy" gravity. This is achieved through applying an electric field pointed downward. If the charge of the particle is -3.0 nC, what is the magnitude of the electric field?
a. 6.9x10^{6} N/C
b. 7.8x10^{5} N/C
c. 1.5x10^{6} N/C
d. 2.1x10^{6} N/C
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