Answer to Question #342269 in Electric Circuits for may

Question #342269

A disk of radius 1.20cm. It has a charged of -6.0nC spread uniformly over the said disk. Find the magnitude and direction of the electric field this disk produces at point A on the axis of the disk a distance of 2.0cm from its center

Expert's answer

E=k\frac{2q}{R^2}\left[1-\frac{z}{\sqrt{z^2+R^2}}\right]

E=9*10^9\frac{2*6.0*10^{-9}}{(0.012)^2}\left[1-\frac{0.02}{\sqrt{0.02^2+0.012^2}}\right]

E=5.34*10^4\:\rm N/C

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