You charge a piece of aluminum foil (mass = 5.97 g) by touching it to a charged

Question

You charge a piece of aluminum foil (mass = 5.97 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 12 mu C. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume it is a uniform field and the aluminum foil is a point charge). What forces are on the aluminum foil as it hovers motionless? What is the net force on the aluminum foil? How does force relate to the electric field? Did you convert all of your values to SI units (meters, kilograms, coulombs, seconds)?

Explanation / Answer

here two forces are acting on the foil

1) weight = mg

2) electrci force = qE

here qE = mg

E = mg/q

E = 5.97*10^-3*9.8/12*10^-6

E = 4875.5 N/C

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