EMF QUIZ-TIME VARYING FIELD

The first Maxwell’s equation in free space

•  $\nabla\times$  H=D+J

•  $\nabla\times$  H=D

•  $\nabla\times$  H=0

•  $\nabla\times$  H=J

For static magnetic field

•  $\nabla\times$  B= $\rho$  

•  $\nabla\times$  B= $\mu$  J

•  $\nabla$ . B= $\mu_0$  J

•  $\nabla\times$  B=0

Displacement current density is

• D

• E

• J

• H

A field can exist if it satisfies

• Gauss’s law
  

• Faraday’s law

• Coulomb’s law

• All Maxwell’s equations

If  $\sigma$   = 2.0 mho/m, E = 10.0 V/m, the conduction current density is

• 5 A per meter Sq
  

• 20 A per meter Sq

• 40 A per meter Sq

• 45 A per meter Sq

Maxwell’s equations give the relations between

• different fields
  

• different boundary conditions

• different sources

• none of these

The boundary condition on E is

• an .  (E1 - E2 ) = 0
  

• an X (E1 - E2 ) = 0

• E1=E2

• none of these

The boundary condition on H is

• an X  (H1 - H2 ) = Js
  

• an .  (H1 - H2 ) = Js

• (H1 - H2 ) = Js

• (H1 - H2 ) = 0

If E is a vector, then  $\nabla$  . $\nabla$  X E is

• -1
  

• 0

• 1

• Indefinite 

For Free Space

•  $\sigma$  = $\infty$  
  

•  $\sigma$  =0

• J $\ne$  0

• None of these