1. Tardigrade
  2. Question
  3. Physics
  4. A ball of mass 1 g and charge 10-8 C moves from a point A, where potential is 600 V to the point B where potential is zero. Velocity of the ball at the point B is 20 cms -1. The velocity of the ball at the point A will be

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A ball of mass 1 g and charge $10^{-8}$ C moves from a point A, where potential is 600 V to the point B where potential is zero. Velocity of the ball at the point B is 20 $cms^{ -1}$. The velocity of the ball at the point A will be

Electrostatic Potential and Capacitance

Solution:

By using, $ \frac{1}{ 2} \, m ( v_1^2 - v_2^2 ) = QV $
$ \frac{ 1}{ 2} \times 10^{ - 3} \, [ v_1^2 - ( 0.2)^2 ] = 10^{ - 8 } \, ( 600 - 0)$
$ v_1 = 22.8 \, cms^{ - 1}$.