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a) What are the magnitude and direction of the electric intensity at a point 18 cm...

a) What are the magnitude and direction of the electric intensity at a point 18 cm from a point charge of –50 µC?

b) An oil drop has a net negative charge of –3e, representing an excess of three electrons. It remains at rest under the action of the force of gravity and the electric force when it is placed in a downward electric field of 3.0x10^5 N/C. Find the mass of the droplet.

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