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A thin disc of radius 60 cm has a hole its center of radius 30 cm. A total charge of

10^-3C is distributed uniformly on its surface. Find E at a point P which is 10 cm. on the central axis of this disc.

What would be the acceleration of an electron passing through point P ?. Mass of electron = 9.11*10^-31 Kg.

How would I set up dq for this?

would it simply be dq= σ2∏rdr? and if it is what is the numerical value for σ?

Thank you!!