Question

A pith ball of mass 0.002kg is charged with 10-4 C. What is the magnitude of electric field intensity
needed to keep the ball at rest in gravitational field?

Answer 1

Answer:

Fe = mg or Electric force = wight Fe = qE

E = mg/q = 0.002kg*10m per secnd square/0.0004c = 100 N per coulomb

E = 100N/c

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