Question

A body of mass 1 g and carrying a charge 10^–8 C passes from two points P and Q. P and Q are at electric potentials 600 V and 0 volt respectively. The velocity of the body at Q is 20 cm/s. Its velocity in m/s at P is-

• A. $\sqrt{0.028}$
• B. $\sqrt{0.056}$
• C. $\sqrt{0.56}$
• D. $\sqrt{5.6}$

Answer 1

Answer: (A)

$\sqrt{0.028}$

Answer 2

V_P = 600 V

V_Q = 0V

Conserving energy,

K_P + U_P = K_Q + U_Q

$\frac { 1 } { 2 }$ + qV_p = $\frac { 1 } { 2 }$ + qV_Q