Two large vertical and parallel metal plates having a separation of $1 \ cm$ are connected to a $DC$ voltage source of potential difference $X$. A proton is released at rest midway between the two plates. It is found to move at $45^{\circ}$ to the vertical $JUST$ after release. Then $X$ is nearly
Two large vertical and parallel metal plates having a separation of $1 \ cm$ are connected to a $DC$ voltage source of potential difference $X$. A proton is released at rest midway between the two plates. It is found to move at $45^{\circ}$ to the vertical $JUST$ after release. Then $X$ is nearly
- [IIT 2012]
- A
$1 \times 10^{-5} \ V$
- B
$1 \times 10^{-7} \ V$
- C
$1 \times 10^{-9} \ V$
- D
$1 \times 10^{-10} \ V$
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