Electromagnetic Theory Quiz

A capacitor with circular plates is being charged. If the electric field between the plates increases at a uniform rate, what is the magnetic field at a distance r from the center inside the plates?

• B=μ0ϵ0 r/2

• B=μ0 r/2

• B=μ0ϵ0 r

• B=0B = 0B=0, since no current flows inside the capacitor

The force(F) experienced by a current (I) carrying conductor of length 'L' and lying parallel to magnetic flux density (B) is (a)   .

If a magnetic monopole exists, which one of the following Maxwell's equations will be modified?

• ∇.D=ρ

• ∇.B=0

• ∇XH=J

• ∇XE=-dB/dt

The unit of ∇XH is (a)  

A metal sphere with 1 m radius and a surface charge density of 10 Coulombs/m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is

• 40π Coulombs

• 10π Coulombs

• 5π Coulombs

• None of the above

The electric field strength at a distance point, P, due to a point charge, +q, located at the origin, is 100 µV/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose center is at the origin, then the electric field strength at the point P outside the sphere becomes.

• 0

• 100 µV/m

• -100 µV/m

• 50 µV/m

Match the Following

• B1n= B2n

• Normal component of H

• H1n ≠H2n (Changes as B1n mu1 and B2n mu2

• Tangential component of B  

• H1t = H2t

• Normal component of B

• B1t ≠ B2t(Changes as ( mu1 H1t and mu2 H

• Tangential component of H

At the boundary between a conductor and a dielectric, the tangential component of the electric field (Et​) is:

• Continuous across the boundary

• Discontinuous and equal to zero inside the conductor

• Equal to the surface charge density

• Always equal to the normal component

The normal component of the magnetic field (Bn​) at a conductor-dielectric interface is:

• Continuous across the boundary

• Discontinuous and equal to zero inside the conductor

• Related to the surface current density

• Independent of permeability (μ)

The tangential component of the magnetic field (Ht​) at a conductor-dielectric interface follows which condition?

• Continuous across the boundary

• Related to the surface current density (Ks​)

• Equal to the normal component

• Independent of the material properties