$\Delta V = -5000~V$
Work Step by Step
We can find the potential difference: $\Delta V = \Delta y~E_y$ $\Delta V = (y_f-y_i)~E_y$ $\Delta V = [0.05~m-(-0.05~m)]~(-50,000~V/m)$ $\Delta V = -5000~V$
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