Use the worked example above to help you solve this problem. Tiny droplets of oi

Question

Use the worked example above to help you solve this problem. Tiny droplets of oil acquire a small negative charge while dropping through a vacuum (pressure = 0) in an experiment. An electric field of magnitude 5.65 times 104 N/C points straight down. One particular droplet is observed to remain suspended against gravity. If the mass of the droplet is 3.72 times 10-12 kg, find the charge carried by the droplet. C Another droplet of the same mass falls 7.8 cm from rest in 0.250 s, again moving through a vacuum. Find the charge carried by the droplet. C Suppose a droplet of unknown mass remains suspended against gravity when Ey = -2.00 times 105 N/C. What is the minimum mass of the droplet? (Take the + y direction to be upward.) kg

Explanation / Answer

m x g = E x minium charge

m x 9.81 = 2 x 10^5 x 1.6 x 10^-19

m =3.265 x 10^-15 kg

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