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Polarization

10 MinsPhysics
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Basic Knowledge of Polarisation of Dielectrics

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Advanced Knowledge of Polarisation of Dielectrics

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Dielectric And Its Effects

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Polarisation

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Important Questions

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of with each other. When suspended in a liquid of density 0.8 , the angle remains the same. lf density of the material of the sphere is 1.6 , the dielectric constant of the liquid is:

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Define dielectric constant of a medium. What is its . unit?

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Dielectric constant for a metal is:

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What are polar and non polar dielectric ,give one example each other ?Define di-electric constants.

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Define the relative permittivity of a medium.

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The ratio of the forces between two small spheres with constant charges, in air and in a medium of dielectric constant , is

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The dielectric constant of an insulator can be

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small drops of mercury each of radius and change coalesce to from a big drop. The ratio of the surface charge density of each small drop with that of big drop is:

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Answer carefully:

(a) Two large conducting spheres carrying charges and are brought close to each other. Is the magnitude of electrostatic force between them exactly given by , where is the distance between their centres?

(b) If Coulomb's law involved 1/ dependence (instead of 1/),would Gauss' law be still true ?

(c) A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point?

(d) What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical?

(e) We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there?

(f) What meaning would you give to the capacitance of a single conductor?

(g) Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).

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A plane electromagnetic wave in a non magnetic dielectric medium is given by with distance being in meter and time in seconds. The dielectric constant of the medium is:

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