Problem 25.17 Part A What is the magnitude of the net electric force on charge B

Question

Problem 25.17 Part A What is the magnitude of the net electric force on charge B in the figure?(Figure 1) ssume a 1.9 cm and b 1.3 cm Express your answer to two significant figures and include the appropriate units. F= 11.49-10-3 IN Submit My Answers Give Up Incorrect; Iry Again, 4 attempts remaining Part B What is the direction of the net electric force on charge B in the figure? O The force is directed up The force is directed down. Submit My Answers Give Up Figure 1 Continue Bi -2.0 nC c-+2.0 nc

Explanation / Answer

the force between A and B is a repulsive force and is directed upwards towards A

F = (9 x 109) (2 x 10-18) / (3.61 x 10-4)

   = 4.986 x 10-5 N

the force between B and C is a attractive force directed downwards

F = (9 x 109) (4 x 10-18) / (1.69 x 10-4)

   = 21.3 x 10-5 N

the net force on B is

Fnet = 21.3 x 10-5 N - 4.986 x 10-5 N

= 16.32 x 10-5 N (downwards)

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