Question

as sugar is poured into a bowl, the rubbing of sugar grains creates a static electric charge that repels the grains, and causes sugar to fly out in all directions. each of two sugar grains have a charge of 2.0X10^-11C at a seperation of 5.0X10^-5 with what force will they repel eachother

Answer 1

As sugar is poured into a bowl, the rubbing of sugar grains creates a static electric charge that repels the grains, and causes sugar to fly out in all directions. each of two sugar grains have a charge of $2.0 \times 10^{-6} - 11 \mathrm{C}$ at a separation of $5.0 \times 10^{-6} - 5$ with what force will they repel each other

Solution

They repel each other with Coulomb's force

$$F = \frac {k q ^ {2}}{r ^ {2}} = 8,99 \cdot 10^{9} \mathrm{N} \cdot \frac {\mathrm{m} ^ {2}}{\mathrm{C} ^ {2}} * \frac {(2.0 \times 10^{-11} \mathrm{C}) ^ {2}}{(5.0 \times 10^{-5} \mathrm{m}) ^ {2}} = 1.44 * 10^{-3} \mathrm{N} = 1.44 \mu \mathrm{N}$$

Answer: $1.44 \mu \mathrm{N}$