A ball of mass $5 g$ and charge $10^{- 7} C$ moves from point A whose potential is $500 V$ to a point B whose potential is zero. The velocity of the ball at the point B, if its velocity at the point A is zero, is

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A ball of mass 1g carrying a charge 10−8C moves from a point A at potential 600V to a point B at zero potential. The change in its K.E. is :

The correct option is C 6×10−6JAs the work has been done by the field so it should be positive.The work done , W=q(VA−VB)We know that change in kinetic energy = work done =q(VA−VB)=10−8(600−0)=6×10−6J.

A ball of mass $1 g$ carrying a charge $10^{- 8} C$ moves from a point A at potential $600 V$ to a point B at zero potential. The change in its K.E. is :

The correct option is C $6 \times 10^{- 6} J$
As the work has been done by the field so it should be positive.
The work done , $W = q (V_{A} - V_{B})$
We know that change in kinetic energy $=$ work done $= q (V_{A} - V_{B}) = 10^{- 8} (600 - 0) = 6 \times 10^{- 6} J$ .