Static Electricity

It happened during Wednesday's physics lesson on charging by friction. A small white object began to slowly emerge from beneath the sleeve of Mr. H's sweater. It took several laughs and giggles from the class before the emerging sheet of fabric softener caught Mr. H's attention. He turned the potentially embarrassing moment into a serendipitous moment. Pulling the sheet out from beneath the sweater, Mr. H wrote the following problem on the board.

A sheet of cationic fabric softener having a surface charge of 3.6x10-12 C (positive) clings to a wool sweater with a negative charge of 6.8x10-9 C. Determine the force of electrical attraction in Newtons if they can be treated as point objects with a separation distance of 0.019 cm.
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