Find the electric field if the surface density at the boundary of air

1.	Find the electric field if the surface density at the boundary of air is 10^-9.
A.	12‚âà√¨‚àö√ë
B.	24‚âà√¨‚àö√ë
C.	36‚âà√¨‚àö√ë
D.	48‚âà√¨‚àö√ë
Answer» D. 48‚âà√¨‚àö√ë

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