The electric field near the surface of the earth points downward and has a magnitude of 60 N/C. Compare the upward electric force on an electron with the downward gravitational force; i.e., what is the ratio Fe Fg ? The elementary charge is 1.6 × 10−19 C and the mass of an electron is 9.11 × 10−31 kg.   What is the magnitude of the charge that should be placed on a coin of mass 4.4 g so that the electric force balances the weight of the coin near the earth’s surface? Answer in units of C.

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The electric field near the surface of the earth
points downward and has a magnitude of
60 N/C.
Compare the upward electric force on an
electron with the downward gravitational
force; i.e., what is the ratio Fe
Fg
? The elementary charge is 1.6 × 10−19 C and the mass
of an electron is 9.11 × 10−31 kg.

 

What is the magnitude of the charge that
should be placed on a coin of mass 4.4 g so
that the electric force balances the weight of
the coin near the earth’s surface?
Answer in units of C.

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