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Solve the all parts of given problem:
Problem: A 24.5-g mass is suspended 3.21 cm above a nonconducting flat plate, directly above an embedded charge of q.
Part A: If the mass has the same charge, q, how much must q be so that the mass levitates (just floats, neither rising nor falling)?
Part B: If the charge q is produced by adding electrons to the mass, by how much will the mass be changed?
Please give me an explanation for above problem.
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Unpolarized light with intensity 390W/m2 passes first through a polarizing filter with its axis vertical, then through a second polarizing filter. What is the angle from vertical of the axis of the second polarizing filter
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