A ball of mass1 g and charge 10-8 C moves from a point A where potential is 600 volt to the point B where potential is zero. Velocity of the ball at the point B is 20 cm. The velocity of the ball at the point A will be
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a
22.8 cm/s
b
228 cm/s
c
16.8 cm/s
d
168 cm/s
answer is A.
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Detailed Solution
By using 12mv12-v22=QV ⇒12×10-3v12-(0.2)2=10-8(600-0) ⇒v1=22.8 cm/s