You hold a ruler that has a charge on its tip 4 cm above a small piece of tissue paper to see if it can be picked up. The ruler has?10 �C of charge. The tissue has 1 g of mass. What is the minimum charge required to pick up the tissue paper?
(answer in �C)
Solution
Here in this case electrostatic force must be at least equal to the gravitational force on the piece of tissure paper.
Fe = Fg
K q1q2 / r2 = m2g
By putting the values from the given data and arranging for q2
( 9109)(1010-6) q2 = 0.001(10)
q2 = 1.110-7C
q2 = 0.11C
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