You need to construct a 100 pF capacitor using two square sheets of metal. The thinnest spacer to hold the squares in place are 0.20 mm thick. What dimension should you use when cutting the square sheets of metal (what is the side of the square in m)

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

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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