A clear plastic ball-point pen is rubbed thoroughly with wool. The charged plast

Question

A clear plastic ball-point pen is rubbed thoroughly with
wool. The charged plastic pen is held above a small, uncharged
disk-shaped piece of aluminum foil, smaller than a hole in a sheet
of three-ring binder paper. (a) Make a clear physics diagram
of the situation, showing charges, fields, forces, and distances.
Refer to this physics diagram in your analysis. (b) Starting
from fundamental physical principles, predict quantitatively how
close you must move the pen to the foil in order to pick up
the foil (that is, predict an actual numerical distance). State
explicitly all approximations and assumptions that you make.

Chabay, Ruth W.; Sherwood, Bruce A. (2014-12-23). Matter and Interactions, 4th Edition: 1-2 (Page 621). Wiley. Kindle Edition.

Explanation / Answer

when we rub plastic pen with woolen cloth,plastic pen acquired negative charge and pen acquired positive charge.if we placed it over aluminium foil it attracts positive charges from it.here we get forces are1)frictional force,because of it we get electricity. 2)Both are seperated by a distace electrostatic force exist.F=(1/4*pi*e0)q1*q2/r*r

3)if charges are rest produce electric field

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