1.Write the wave equation in free space in terms of the
magnetic flux density.
ANSWER: ∇²B - μ₀ε₀ ∂²B / ∂t² = 0 where μ₀ is the
permeability of free space and ε₀ is the permittivity of free
space.
2. Mention the significance of Lenz law in electromagnetic
theory.
ANSWER: Lenz's law states that the direction of the induced
electromotive force (EMF) and induced current in a closed
loop is always such that it opposes the change in magnetic
flux that produces it. This ensures the conservation of energy.
3. State the relation between current density and electric field
intensity.
ANSWER: J = σE where σ is the conductivity of the material.
This is Ohm's law in point form.
magnetic flux density.
ANSWER: ∇²B - μ₀ε₀ ∂²B / ∂t² = 0 where μ₀ is the
permeability of free space and ε₀ is the permittivity of free
space.
2. Mention the significance of Lenz law in electromagnetic
theory.
ANSWER: Lenz's law states that the direction of the induced
electromotive force (EMF) and induced current in a closed
loop is always such that it opposes the change in magnetic
flux that produces it. This ensures the conservation of energy.
3. State the relation between current density and electric field
intensity.
ANSWER: J = σE where σ is the conductivity of the material.
This is Ohm's law in point form.
