Electrostatics Question 438

Question: A ball of mass 1 g and charge 10−8C 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/s. The velocity of the ball at the point A will be [KCET 2001]

Options:

A) 22.8 cm/s

B) 228 cm/s

C) 16.8 m/s

D) 168 m/s

Show Answer

Answer:

Correct Answer: A

Solution:

By using 12m(v12−v22)=QV

therefore 12×10−3v12−(0.2)2=10−8(600−0)

therefore v1=22.8cm/s

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