Particles of charge +65, +48, and ?95 ? C are placed in a line ( Figure 1 ) . Th
ID: 1269978 • Letter: P
Question
Particles of charge +65, +48, and ?95 ?C are placed in a line (Figure 1) . The center one is L = 40cm from each of the others.
a) Calculate the net force on the left charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left. Express your answer to two significant figures and include the appropriate units.
b) Calculate the net force on the center charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left. Express your answer to two significant figures and include the appropriate units.
c) Calculate the net force on the right charge due to the other two. Enter a positive value if the force is directed to the right and a negative value if the force is directed to the left. Express your answer to two significant figures and include the appropriate units.
Explanation / Answer
a ) F12 = k*q1*q2/r12^2 = (9*10^9*65*10^-6*48*10^-6)/(0.4^2) = -175.5 N
F13 = k*q1*q3/r13^2 = (9*10^9*65*10^-6*95*10^-6)/(0.8^2) = +86.836N
Fnet = F12 + F13 = -88.664 N
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b) F12 = k*q1*q2/r12^2 = (9*10^9*65*10^-6*48*10^-6)/(0.4^2) = +175.5 N
F13 = k*q2*q3/r23^2 = (9*10^9*48*10^-6*95*10^-6)/(0.4^2) = +256.5N
Fnet = F12 + F13 = +432 N
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C) F12 = k*q2*q3/r23^2 = (9*10^9*48*10^-6*95*10^-6)/(0.4^2) = -256.5N
F13 = k*q1*q3/r13^2 = (9*10^9*65*10^-6*95*10^-6)/(0.8^2) = -86.836N
Fnet = F12 + F13 = -343.336 N