Point P is $3\mathrm{.}66$ x$10-4$m from a small metal sphere A with a negative charge of $2\mathrm{.}37$ x$10-10$C$.$ A second sphere, B with a positive charge of $5\mathrm{.}68$ x$10-7$C also contributes to the field. See diagram below. Note that the angle$$$=54\mathrm{.}2.$

$$

a$)$ Determine the number of excess electrons on sphere A$$

b$)$ Determine the net electric field at P:$$at a standard angle of$$

c$)$ Determine the magnitude of the electric field at a point midway between A and B $($and in line with them$)$