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X and Y are large, parallel conducting plates close to each other. Each face has an area A. X is given a charge Q. Y is without any charge. Point A, B and C are as shown in the figure. Find the incorrect option.

1.  the field at B is $\frac{\mathrm{Q}}{2{\mathrm{\epsilon }}_{0}\mathrm{A}}$

2.  the field at B is $\frac{\mathrm{Q}}{{\mathrm{\epsilon }}_{0}\mathrm{A}}$

3.  the fields at A, B and C are of the same magnitude

4.  the fields at A and C are of the same magnitude, but in opposite directions