Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

None of these
Charge per unit area becomes very high for lightening to discharge
Rain drops may not collect
Dust particles may not accumulate

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

 change in physical dimensions of ferromagnetic materials during magnetism.
 change in permeability of ferromagnetic materials during magnetism.
 generation of electricity in ferromagnetic materials.
 generation of magnetism in electrical conductors.

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Electromagnetic Field Theory
The statement which is not correct from the following:

 Gauss’s static that divergence of D = ρu.
 An electric flux line is an imaginary path or a line drawn in such a way, that its direction at any point is the direction of electric field at that point.
 Gauss’s law states that total electric flux through any surface is equal to the total charge enclosed by surface.
 For a uniform long charged line with l1 c/m the electric field intensity E is given as E = ρL/(π ε0.r).

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