Answer:
Step-by-step explanation:
The net charge of an object is equal to the number of electrons removed or added multiplied by the charge of an electron (1.6 x 10^-19 C).
Given: Q = 7.5 x 10^-11 C
To find the number of electrons removed we can use the formula :
Q = n * e
where Q is the charge, n is the number of electrons, and e is the charge of an electron
n = Q/e
Therefore, n = 7.5 x 10^-11 C / 1.6 x 10^-19 C = 4.6875 x 10^8 electrons
So, 4.6875 x 10^8 electrons have been removed from a positively charged cube with a net charge of 7.5 x 10^-11 C