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A disc is kept on xy plane with centre a...

A disc is kept on xy plane with centre at origin. Find electric field at a point with distance Z from origin on z-axis.

A

`(sigma(1 -(Z/(sqrt(Z^2+r^2))))/epsilon_0)`

B

`(sigma(1 -(Z/(sqrt(Z^2+r^2))))/2 epsilon_0)`

C

`(sigma(1 +(Z/(sqrt(Z^2+r^2))))/epsilon_0)`

D

`(sigma(1 -(Z/(sqrt(Z^2-r^2))))/epsilon_0)`

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