An object has a charge of -4.9 uC. How many electrons must be removed so that charge become + 1.4 uC?
To find out how many electrons must be removed, we need to determine the change in charge between the initial and final states.
The initial charge is -4.9 uC, and the final charge is +1.4 uC. The change in charge is given by:
Final charge - Initial charge = (+1.4 uC) - (-4.9 uC)
= 1.4 uC + 4.9 uC
= 6.3 uC
Since each electron has a charge of -1.6 x 10^-19 C, we can calculate the number of electrons needed to create a charge of 6.3 uC:
Number of electrons = (Change in charge) / (Charge of one electron)
= (6.3 uC) / (-1.6 x 10^-19 C)
= -3.938 x 10^13 electrons
Therefore, approximately 3.938 x 10^13 electrons must be removed for the object to have a charge of +1.4 uC.