A conductive square with dimensions 2cm 2cm is at rest on the surface of a table

Question

A conductive square with dimensions 2cm 2cm is at rest on the surface of a table.
A rod charged to Q = 5C is brought within 1cm of the top surface of the square
(Figure 2).
a) Draw a picture of the rod and square once they reach equilibrium.
b) Consider the rod to be a point charge and the square to be a dipole.
i) What is the dipole moment of the square?
ii) If you want to electrostatically lift the square, what is the minimum mass that
the square can have?
c) A wire now connects the square to Earth.
i) If the positive charges are the charge carriers, will the square gain or lose mass?
ii) If the negative charges are the charge carriers, will the square gain or lose mass?
iii) What causes this gain or loss of mass? Explain how it happens.

Explanation / Answer

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