EASY
Earn 100

The dielectric strength of air is nearly.

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Important Questions on Electrostatics

MEDIUM
If relative permittivity for any substance is 80 then its electric susceptibility is _____
MEDIUM

Explain the behaviour of dielectrics in an external field.

 

MEDIUM
The dimensional formula of Polarization P is _____
EASY
For a polar molecule, which of the following statements is true?
EASY

The capacity of a parallel plate capacitor with air is 18 pF When a dielectric material is inserted in the space between the plates, its capacity becomes 108 pF.Calculate the permittivity of the material. What is the material?(ε0=8.854×10-12C2N-1m-2)

EASY
Which of the following option is the pair of polar molecules?
HARD
Define polar and non-polar molecules. Explain the behaviour of non-polar molecules in a uniform magnetic field.
HARD
The force of repulsion between two identical positive charges when kept, with a separation 'r' in the air is ' F '. Half the gap between the two charges is filled by a dielectric slab of dielectric constant =4. Then, the new force of repulsion between those two charges becomes
HARD

What is a capacitor? You know that the capacity of a parallel plate condenser is C=ε0 Ad. What will be its new capacitance C' of the capacitor if a material of dielectric K is inserted between the plates? Calculate the capacitance of the capacitor shown below.

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EASY
Write the definition of dielectric constant of a medium.
EASY
Which of the statements is false in the case of polar molecules?
MEDIUM
Distinguish between polar and non-polar dielectrics.
EASY
The unit of polarizabity of the molecule is _____
EASY

In the figure, there are two patterns of electric field lines absent of dielectric [Fig. (a)] and in presence of dielectric slab [Fig. (b)]. The relative permittivity of the dielectric slab is,
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EASY
Assertion: For a system of two point charges, the ratio of the magnitude of electrostatic force experienced by each charge depends upon the medium between the point charges.

Reason: The magnitude of the electrostatic force between two point charges q1 and q2 separated by a distance r is 14πε0Kq1q2r2, if the charges are placed in a medium of dielectric constant K.
EASY
If dielectric constant and dielectric strength be denoted by K and X respectively, then a material suitable for use as a dielectric in a capacitor must have
EASY
The constant k in Coulomb’s law depends on