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Find electron number...

Two large circular discs separated by a distance
of 0.01 m are connected to a battery via a
switch as shown in the figure. Charged oil
drops of density 900 kg m³ are released
through a tiny hole at the center of the top disc.
Once some oil drops achieve terminal velocity,
the switch is closed to apply a voltage of 200 V
across the discs. As a result, an oil drop of
radius 8 x 107 m stops moving vertically and
floats between the discs. The number of
electrons present in this oil drop is
(neglect the buoyancy force, take acceleration
due to gravity = 10 ms and charge on an
electron (e) = 1.6 × 10-¹⁹ C)
²

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