Review session

Serway Problem $15\mathrm{.}24$:

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a$.$ Find the magnitude and direction of the electric field at the position of the $2\mathrm{.}00C,$ charge in Figure P$15\mathrm{.}13.$

b$.$ How would the electric field at that point be affected if the charge there were doubled? Would the magnitude of the electric force be affected?

Figure P$15\mathrm{.}13$

Details

A graph shows three charges forming an equilateral triangle of side $0\mathrm{.}500$ meter.

Positive charge $2\mathrm{.}00$ micro coulombs is at origin, negative charge $4\mathrm{.}00$ micro coulombs is on positive x $-$axis, and positive charge $7\mathrm{.}00$ micro coulombs is on the $xy$ plane.