Liquid Metal Rain drops !

Kepler2-229b is a planet which has uniformly collected, positively charged cosmic dust on its surface.

Notes:

• Take the raindrop to be a complete sphere of radius $r.$
• Ignore gravity and air resistance.
• The raindrop is neutral.

Given Information:

• The distance between the planet and the raindrop is $d.$
• The radius of the planet is $13.14567\text{ km}.$
• The charge on the planet is $Q = 10^{12}\text{ C}.$
• The radius of the droplet is $1\text{ cm}.$
• The mass of the drop $1\text{ g}.$

Find the acceleration of the raindrop when it is at a distance of $d = 1000\text{ km}.$

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Note: This problem is original.