an object has a charge of -2.0 microcoloumbs, how many electrons must be removed so that the charge becomes +3.0 microcoloumbs?
I'm not sure of which formula to use
To determine the number of electrons that need to be removed, we can use the formula that relates charge, the elementary charge, and the number of electrons. The elementary charge is the charge of a single electron, which is approximately 1.6 x 10^-19 Coulombs.
The formula is:
charge = (number of electrons) x (elementary charge).
Let's first convert the given charges to Coulombs:
-2.0 μC = -2.0 x 10^-6 C
+3.0 μC = +3.0 x 10^-6 C
Now we can set up equations using the formula above:
-2.0 x 10^-6 C = (number of electrons) x (1.6 x 10^-19 C)
Solving for the number of electrons, we have:
(number of electrons) = (-2.0 x 10^-6 C) / (1.6 x 10^-19 C)
Similarly:
+3.0 x 10^-6 C = (number of electrons) x (1.6 x 10^-19 C)
(number of electrons) = (+3.0 x 10^-6 C) / (1.6 x 10^-19 C)
Now you can substitute the values into the equations and calculate the number of electrons needed to be removed.