Question
The earth has a downward-directed electric field near its surface of about 150 N$/$C. If a raindrop with a diameter of 0.020 mm is suspended, motionless, in this field, how many excess electrons must it have on its surface?
Step 1
020 mm. The raindrop is suspended motionless in this field, which means the electric force is balanced by the gravitational force. We can write this as: \[F_{electric} = F_{gravity}\] Show more…
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