You rub a glass rod with a silk handkerchief, which transfers electrons from the

Question

You rub a glass rod with a silk handkerchief, which transfers electrons from the silk to the glass. You made sure that the rod was initially electrically neutral. You have a device that is able to measure charge, and it tells you that the rod has a charge of -4.8 C.

a. How many electrons were transferred from the silk to the rod?

b.  What is the electric charge of the handkerchief immediately after it finishes being in contact with the rod? Assume it was initially neutral.

c. The charged portion of the rod has a length of 12 cm. Assuming that the charge was approximately evenly distributed, what is the resulting linear charge density on the charged portion of the rod?

Explanation / Answer

A) Number of electrons = total charge / charge of an electron

= - 4.8e-6/-1.6e-19

= 3*10^13 electrons

B) charge on handkerchief = +4.8 C

C) Linear charge density = - 4.8e-6/0.12

= - 4*10^-5 C/m   

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