A pair of vertical conducting plates $X$ and $Y$ are arranged with a separation of $6.0\,\text{mm}$ in air. The $60\,\text{V}$ d.c. supply is connected as shown. What is the electric field strength at $E$, the point halfway between the plates?
- A$1.0 \times 10^{4}\,\text{V m}^{-1}$ towards $X$
- B$1.0 \times 10^{4}\,\text{V m}^{-1}$ towards $Y$
- C$2.0 \times 10^{4}\,\text{V m}^{-1}$ towards $X$
- D$2.0 \times 10^{4}\,\text{V m}^{-1}$ towards $Y$