A25cm×25cm horizontal metal electrode is uniformly charged to +50 nc . what is the electric field strength 2.0 mm above the center of the electrode?
express your answer to two significant figures and include the appropriate units.

The electric field strength is

Solution:

As per the question:

Area of the electrode,

Charge, q = 50 nC =

Now,

To calculate the electric field strength, we first calculate the surface charge density which is given by:

Now, the electric field strength of the electrode is:

where

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