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An electrical insulator is a a materials or objects which resist the flow of electrical charge through it . Electrical insulator lack movable electric charge, this is because the electrons in the materials including the outermost ones are strongly bound to the atom.

When an electrical potential difference is applied across an electrical insulator no free charge are exposed to the electric field and so there will be no flow of charge and electric current cannot arise hence electric insulator has infinite resistance and zero conductance. Example of insulator materials are glass, mica, paraffin, hard rubber and also many plastic materials.

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