# Physics

calculate the force between two identical charges of 1.0 x 10 exp -9 C separated by 1.0 Cm

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1. Look up Coulomb's Law in your textbook or course notes.

F = k Q1*Q2/r^2

Depending upon which constant k you use, you may need to convert the r = 1 cm separation to 0.01 m.

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2. for same question above if the charge is increased by a factor of 10 what number am I increasing? and am I increasing it by adding or multiplying?

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3. When you are talking factors. you increase by multiplying.

A factor of 10 increase in the charge increases the force by a FACTOR of 100, since the charge gets squared when the two charges are equal.

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