A very large sheet of a conductor carries a uniform charge density of on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor?

Complete Question

A very large sheet of a conductor carries a uniform charge density of  on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor?

The electric field is  

Explanation:

From the question we are told that

    The charge density is  

    The position outside the surface is  

Generally the electric field is mathematically represented as

Where   is  the permitivity of free space with values  

substituting values  

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explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it