3) You rub a glass rod with a silk handkerchief. You made sure that the rod was

Question

3) You rub a glass rod with a silk handkerchief. You made sure that the rod was initially electrically neutral. You have a device that is able to measure charge magnitude, but unable to distinguish between positive versus negative charge. You find that the glass rod has a electric charge magnitude of 78.4 C. You want to figure out whether the rod gained or lost electrons, and how many electrons were transferred between the silk and the rod. Fortunately, you have access to this handy triboelectric series table to help you. [Your answer should be positive if the rod gained electrons.]

4) The charged portion of the rod has a length of 11 cm. Assuming that the charge was approximately evenly distributed, what is the resulting linear charge density on the charged portion of the

Explanation / Answer

Here ,

charge , q = 78.4 uC

3) when a glass rod is rubbed silk cloth , the charge on the rod is positive .

hence , the electrons are lost by the rod.

number of electrons lost = q/e

number of electrons lost = 78.4 *10^-6/(1.602 *10^-19)

number of electrons lost = 4.894 *10^14

4)

linear charge density = q/L

linear charge density = 78.4 *10^-6/(0.11)

linear charge density = 7.127 *10^-4 C/m

the linear charge density on the rod is 7.127 *10^-4 C/m

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