A body of mass 4 gm carrying a charge 1μ C starts from rest at the positiv

Question

A body of mass 4 gm carrying a charge 1

μ

C starts from rest at the positive plate and reaches the negative plate of a parallel plate condenser with final velocity of 0.3 m/s. The potential difference between the plates is?

Options:

A . 180 V

B . 360 V

C . 90 V

D . 18 V

Answer: Option A
:
A

\frac{1}{2} m v^{2} = q V

\frac{1}{2} \times 4 \times 10^{- 3} \times 9 \times 10^{- 2} = 10^{- 6} V

V = 180 V

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