you drop your cell phone while in the bathroom in front of the mirror while the water is running in the sink. if you are holding the phone at 0.45 meters above the sink, how long do you have before you know your cellphone was a gonner?

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

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force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach