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As the conductor contains free charges (electrons), these move towards the positive plate, making the surface of the conductor closer to the positive plate of the capacitor negatively charged. These are called induced charges. Consequently, the surface of the conductor at the end closer to the negative plate is positively charged. The motion of charges continue till the internal electric field created by induced charges cancel the external field, thereby making the field inside the conductor zero. |
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Dielectric in an Electric Field |
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A dielectric consists of molecules which may (polar) or may not (non-polar) have permanent dipole moment. Even in the former case, the dipoles in a dielectric are randomly oriented because dipole energies are at best comparable to thermal energy.
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