Question

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

• A. $-6\times {10}^{-6}erg$
• B. $-6\times {10}^{-6}J$
• C. $6\times {10}^{-6}J$
• D. $6\times {10}^{-6}erg$

Answer 1

The correct option is C $6\times {10}^{-6}J$

As work is done by the field , KE of the body increases by
$KE=W=q(V_A-V_B)$
${10}^{-10}(600-0)$
$6\times {10}^{-6}j$