2. (5 pts) Two 3-g balls of unknown, accelerate away from each other at a o each

Question

2. (5 pts) Two 3-g balls of unknown, accelerate away from each other at a o each ball? but identical charge are separated by 5 cm. if the two balls identical S m/s', what is the sign and magnitude of charge on As they fly through the air, honeybees can pick up a small amount of electric 0.12-g bee acquires a charge of -55 pC (1 pC 1012C). a) Explain whether the bee as gained or lost electrons. (1 pt) b) How many electrons has the bee gained or lost? (2 pts) c) Find the electric force (magnitude and direction) on the bee if electric field just above charge. Suppos 3. Earth's surface is 120 N/C, directed vertically downward. (2 pts)

Explanation / Answer

2. givne m = 3 g

charge = q ( identical on two balls)

d = 5 cm

a = 0.25 m/s/s

from newtons second law

force on ball = m*a = 0.00075 N

from coloumbs law

F = kq^2/d^2

hence

q = 1.444*10^-8 C

3. given m = 0.12 g

q = -55*10^-12 C

a. as the charge on bee is -ve, that means the honey bee gained electrons

b. numbher of electrons gained = q/1.6*10^-19 = 343750000

c. given E = 120 N/C

hence

force F = qE = 0.0000000066 N = 66*10^-10 N

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