You charge a piece of aluminum foil by touching it to a charged rod. The charged

Question

You charge a piece of aluminum foil

by touching it to a charged rod. The charged rod gives the aluminum foil a charge of

You charge a piece of aluminum foil (mass = 6.21 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 15 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).

Explanation / Answer

Here

mg = qE

Therefore

E = (6.21*10^-3*9.8)/(15*10^-6)

= 4057.2 N/C

It shuld be directed in Upward Direction

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