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Electrostatics of Conductors :, , 1. Net electric field intensity in the interior ofa, conductor is zero., , So, the net electrostatic field inside, the conductor is zero., , Electric field just outside the charged, conductor is perpendicular to the surface of, the conductor., , ee, , Suppose the electric field is acting at an, angle other than 90°, then there willbea, component E cos 6 acting along the tangent, at that point to the surface which will tend to, accelerate the charge on the surface,Then it, will move, But it is impossible in, electrostatics. So, 8 = 90° and cos han Oe

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3. Net charge in the interior of a conductor is zero., , The charges are temporarily separated. The total, charge of the system is zero., , >-—> q, ee, , a, =), , is n the inte r of the, , 5 ', a i ed, , 4. Charge always resides on the surface ofa, conductor., , 5. Electric potential is constant inside the, conductor., , B=-dVicir So dV=-E . dr, Since E = O inside the conductor, therefore = |

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6. Electric field at the surface of a charged, , conductor is E=o/c’

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Dielectrics:, , Eg. Air, H,, glass, mica, paraffin wax, transformer oil, etc., , When a non-polar dielectric slab is, subjected to an electric field, dipoles, are induced due to separation of, effective positive and negative centres., , [Se hee eee re eee, , E, is the applied field and E, is the, induced field in the dielectric., , The net field is E= E, - E,, , 1}

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Noes tlarmivicleGiios=, , Eg. N., , C H,, O., CC, H,, etc, , In the absence of external, electric field, the effective, positive and negative, , and hence dipole is, not formed., , Due to, CUCM Amt ete m ect