Free Printable EMF QUIZ-TIME VARYING FIELD

1.

The first Maxwell’s equation in free space

a)

$\nabla\times$ H=D+J

b)

$\nabla\times$ H=D

c)

$\nabla\times$ H=0

d)

$\nabla\times$ H=J

2.

For static magnetic field

a)

$\nabla\times$ B= $\rho$

b)

$\nabla\times$ B= $\mu$ J

c)

$\nabla$ . B= $\mu_0$ J

d)

$\nabla\times$ B=0

3.

Displacement current density is

a)

D

b)

E

c)

J

d)

H

4.

A field can exist if it satisfies

a)

Gauss’s law

b)

Faraday’s law

c)

Coulomb’s law

d)

All Maxwell’s equations

5.

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

a)

5 A per meter Sq

b)

20 A per meter Sq

c)

40 A per meter Sq

d)

45 A per meter Sq

6.

Maxwell’s equations give the relations between

a)

different fields

b)

different boundary conditions

c)

different sources

d)

none of these

7.

The boundary condition on E is

a)

an . (E1 - E2 ) = 0

b)

an X (E1 - E2 ) = 0

c)

E1=E2

d)

none of these

8.

The boundary condition on H is

a)

an X (H1 - H2 ) = Js

b)

an . (H1 - H2 ) = Js

c)

(H1 - H2 ) = Js

d)

(H1 - H2 ) = 0

9.

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

a)

-1

b)

0

c)

1

d)

Indefinite

10.

For Free Space

a)

$\sigma$ = $\infty$

b)

$\sigma$ =0

c)

J $\ne$ 0

d)

None of these

11.

The electric field for time varying potentials

a)

E=- $\nabla$ V

b)

E=- $\nabla$ V-A

c)

E= $\nabla$ V

d)

E=

\nabla

V+A

12.

For time varying EM fields

a)

$\nabla$ XH=J

b)

$\nabla$ XH=D+J

c)

$\nabla$ XE=0

d)

None of these

13.

The electric field just above a conductor is

a)

normal to the surface

b)

tangential to the source

c)

Zero

d)

Infinite

14.

The normal components of D are

a)

continuous across a dielectric boundary

b)

discontinuous across a dielectric boundary

c)

Zero

d)

Infinite

15.

For Good dielectric

a)

J=1

b)

J=Infinite

c)

J=23

d)

J=0

EMF QUIZ-TIME VARYING FIELD

Total questions: 15

Worksheet time: 8mins

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