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Standard XII
Physics
Continuous Charge Distribution
Question

Explain briefly, using a paper diagram, the difference in behaviour of a conductor and a dielectric in the presence of external electric field.

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Solution
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(a) When a conductor is placed in an electric field, charge distribution takes place. This distribution in such a way that the electric field is zero inside the conductor (that is after the charge is distributed and reached a stable state)
The electric field due to the induced charge concels the external (Ref image 1.)
When a dielectric is placed in the external electric field, an induced electric field appears in the dielectric in the opposite direction of external electric field, [having the magnitude $$\frac{E_0}{k}$$ as net field(Refer image2.)

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Similar Questions
Q1
distingusih the differnece in behaviour of conductor and a di-electric placed in an exernal field. how does polarized di-electric modify the original external field
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Q2

Write a relation for polarisation→P of a dielectric material in the presence of an external electric field →E

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Q3
(a) Distinguish with the help of a suitable diagram, the difference in the behaviour of a conductor and a dielectric placed in an external electric field. How does polarised dielectric modify the original external field?
(b) A capacitor of capacitance C is charged fully by connecting it to a battery of emf E. It is then disconnected from the battery. If the separation between the plates of the capacitor is now doubled, how will the following change?
(i) Charge stored by the capacitor.
(ii) Field strength between the plates.
(iii) Energy stored by the capacitor.
Justify your answer in each case.
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Q4

In the presence of an electric field, the charge carriers in a conductor, drift in the opposite direction with respect to the electric field.

But in a dielectric, the external electric field causes polarisation and the internal field is in or opposite to the direction of the electric field? In the T.B it says that it is in the direction. And then elsewhere it says it doesnt cancel but reduces the effect! I dont get it.

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Q5
Explain why the electric field inside a conductor placed in an external electric field is zero.
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