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For balancing the particle, force due to electric field and gravitational field must be equal to each other......
Fe = Fg
qE = mg
calculate E from here as all other values are given in the question........
E = 6.64 × 10^-3 × 10 /3.2 × 10^-19
= 2.075 × 10^17 NC-1
The direction of the electric field will be upward.....
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