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A positive point charge is held initially at a distance d from a positively charged infinite...

A positive point charge is held initially at a distance d from a positively charged infinite line of charge, where it experiences a repulsive force.
After being released, and when the charge has reached twice the initial distance, the magnitude of the force will have ...

Increased by a factor of four
Increased by a factor of two
Stayed the same
Decreased by a factor of two
Decreased by a factor of four

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