Posted by Anonymous on Monday, January 30, 2012 at 9:22pm.
Require than m * g = q * E
q is the charge. m is the mass in kg.
g is the acceleration of gravity, in m/s^2.
E is the field strength, in N/C
Solve for the field, charge, q, in Coulombs.
The charge must be negative so that the upward electrical force can balance the weight.
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