
The dielectric strength of air is nearly.

Important Questions on Electrostatics

Explain the behaviour of dielectrics in an external field.



The capacity of a parallel plate capacitor with air is When a dielectric material is inserted in the space between the plates, its capacity becomes .Calculate the permittivity of the material. What is the material?()




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






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,

Reason: The magnitude of the electrostatic force between two point charges and separated by a distance is , if the charges are placed in a medium of dielectric constant .



For the metallic conductor

