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Only a c f that is a small sphere , small shell , two thin shells will behave as if all charge Q us at center or origin because if we will make a gaussian surface that is a sphere of radius 2m centered at origin we can use gauss law to find electric field at specified point and
It is surface integral of elecric field over a closed gaissian surface is equal to 1/epsilon_0 times charge enclosed by that surface
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