Question

Two charged particles of charge + 2q & +q have masses m and 2m respectively. They are kept in same uniform electric field and allowed to move for same time. The ratio of their kinetic energies is-

• A. 8 : 1
• B. 16 : 1
• C. 2 : 1
• D. 3 : 1

Answer 1

Answer: (A)

8 : 1

Answer 2

In electric field; a =

vel. of charge particle after time t = at Ž v = t

K.E. = 1/2 mv² = 1/2m = 1/2

= = $\left( \frac { 2 q } { q } \right) ^ { 2 }$×= 8 :1