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In figure, two equal positive point charges q1 = q2 = 2.0 μC interact with a third point charge Q = 4.0 μC. The magnitude, as well as direction, of the net force on Q is

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a

0.23 N in the +x-direction

b

0.46 N in the +x-direction

c

0.23 N in the -x-direction

d

0.46 N in the -x-direction

answer is B.

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Detailed Solution

Fnet =2F31cos⁡α =2×14πε0×2×4×10−12(0.5)2×45=0.46N

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In figure, two equal positive point charges q1 = q2 = 2.0 μC interact with a third point charge Q = 4.0 μC. The magnitude, as well as direction, of the net force on Q is