What are the magnitude and direction of the electric field that will balance the
weight of (a) an electron and (b)
Let, the mass of electron be denoted as 'm' , magnitude of electric field be 'E' , acceleration due to gravity be 'g' and charge of electron be 'e'
It is known that weight(W) of a particle always acts in the downward direction and its value is = mg
Now, to balance this weight , an equal amount of force(F) is required to be applied in the upward direction.
It is known that the amount of force experienced by an electron in an electric field is :
F = eE
and its direction is opposite to that of the electric field. So, to produce force in upward direction, the electric field must be directed in downward direction.
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