A dust particle has a mass of 0.02 grams and a negative charge of 50 nC. What el

Question

A dust particle has a mass of 0.02 grams and a negative charge of 50 nC. What electric field magnitude and direction are needed to exactly weigh the balance of the acceleration to be zero?

How to do this problem? Answer circled may or may not be correct. Not sure. I attempted qE=mg, and I keep getting answer D.

6. A dust partide has a mass of 0.02 grams and a negative charge of 50 nC. What electric field magnitude and direction are needed to exactly balance the weight of the particle so that its acceleration is zero? (g 9.8 m/s') A) 9800-N/c B) 9800 N/C C) 7.8 X 10 N/C down D) 3900 N/C up E) 3900 N/C down 1

Explanation / Answer

Eq=mg expression is right.

E=(mg/q)=0.02*10-3*9.8/(50*10-9)

=3920 N/C down

Option E) 3900 N/C down is right answer.

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