What is floatation?
2 answers:
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Let 10 nC and 20 nC charge is placed at "d" distance
now let say we will have a point at distance "x" from 10 nC at which electric field will be zero
now we will have
now plug in all data
square root both sides
so yes there will exist a point between 10 nC and 20 nC charge at which electric field will be zero