Edit ViewHistory Bookmarks Window Help session-masteringphysics.c Chap 19 Proble

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Edit ViewHistory Bookmarks Window Help session-masteringphysics.c Chap 19 Problem 19.86 Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.240 g and a charge of magnitude q. The balls are attracted to each other, and the threads atached to the balls make an angle of 20.0 wilth the vertical, as shown in the figure. (Figure 1) Part A Find the magnitude of the electric force acting on each ball. Submit Request Answer Part B Find the tension in each of the threads. Submit Request Answer - Part Find the magnitude of the charge on the bails. aC Submit Request Answer Figure 1 of 1

Explanation / Answer

the system is in equilibrium net force = 0

along horizontal

net force = 0

T*sintheta - Fe = 0

T*sintheta = Fe ..............(1)

along vertical

Fnet = 0

T*costheta - mg = 0

T*costheta = m*g .........(2)

tantheta = Fe/mg

electric force Fe = m*g*tantheta

Fe = 0.24*10^-3*9.8*tan20 = 0.856*10^-3 N <<<_---------------ANSWER

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part(b)

from equation (2)

T*costheta = mg

T = mg/costheta

T = 0.24*10^-3*9.8/cos20

T = 2.5*10^-3 N   <<<_---------------ANSWER

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part(c)

Electric force Fe = k*q*q/r^@

r = seperation betwen charges = 2.05 cm = 2.05*10^-2 m

0.856*10^-3 = 9*10^9*q*q/(2.05*10^-2)^2

charge q = 6.32 nC <<<_---------------ANSWER

DONE please check the answer. any doubts post in comment box

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