Question

A plastic rod is rubbed against a wool shirt,
thereby acquiring a charge of −4.9 µC.
How many electrons are transferred from
the wool shirt to the plastic rod? The elemental
charge is 1.6 × 10−19 C.

Answer 1

A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of -1 µC.Thus there will transfer of electron take place. So problem is to find how many electrons will transfer from the wool shirt to the plastic rod?

Since we know 1C charge acquired when 1.6x10^19 electrons transferred.

Since

1C=10^6 mu C
Thus

10^6 mu C acquired when 1.6x10^19 electrons transferred.

1 mu C acquired when (1.6x10^19)/10^6 electrons transferred which equal to

=1.6x10^(19-6)
=1.6x10^13
Thus in acquiring -1 mu C charge there will 1.6x10^13 electrons will transfer from wool shirt to plastic rod.

Answer 2

incorrect

Answer 3

-19+6 = -13
so
1.6 * 10^-13 uC /electron
so
(1/1.6)*10^13 electrons/uC
= .625 * 10^13
= 6.25 * 10^12 electrons

Answer 4

3.0625E13