The figure shows three particles initially fixed in place, with B and C identica

Question

The figure shows three particles initially fixed in place, with B and C identical and positioned symmetrically about the y axis, at distance d from A.

a) In what direction is the net gravitational force Fnet on A?

answer options: Along the +y axis, Along the -y axis,The net force is zero

b)If we move C directly away from the origin, does Fnet change in direction? If so, how and what is the limit of the change?

answer options:The force changes direction toward point B, eventually pointing directly at B, The force changes direction toward point C, eventually pointing directly at C, The force does not change in direction, The force moves away from point A

Explanation / Answer

a)

The gravitational force is always attractive. Thus, the force due to masses at B and C on A will be directed along y axis as the x components gets cancelled

: Along the +y axisb)

If the mass at C is moved away, the only force acts on A is due to mass at B. Thus, The force changes direction toward point B, eventually pointing directly at B

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