#### Force is a Vector!

Force is a vector, and it's critical to add forces as vectors whenever there is more than one force being exerted. Consider some two-dimensional situations, all involving the net force the positive charge at the center of a square experiences because of equal-magnitude charges placed at each corner of the square.

**Configuration 1.** The net force on the positive center charge is toward the top-right.

What are the signs of the equal-magnitude charges occupying each corner?

How many possible configurations can you come up with that will produce the desired force?

**Configuration 2.** The net force on the positive center charge is straight down.

What are the signs of the equal-magnitude charges occupying each corner?

How many possible configurations can you come up with that will produce the desired force?

**Configuration 3.** The net force on the positive center charge is zero.

What are the signs of the equal-magnitude charges occupying each corner?

How many possible configurations can you come up with that will produce the desired force?

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