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Electricity and Magnetism

Total questions: 20

Worksheet time: 33mins

Name
Class
Date
1.

Discovered that electric current create magnetic field, which was the first connection found between electricity and magnetism.

a)

Michael Faraday

b)

Hans Christian Oersted

c)

James Clerk Maxwell

d)

Benjamin Franklin

2.

What is the flux density in a magnetic field where the flux for 0.1 square meter is 600μWb?

a)

0.6mT

b)

0.6T

c)

6mT

d)

60mT

3.

In thermal ohm's law, temperature and power loss are analogous to ____ respectively of ohm's law.

a)

V and I

b)

R and V

c)

I and R

d)

I and V

4.

The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

a)

Newton's First law

b)

Faraday's first law of electromagnetic induction

c)

Coulomb's first law

d)

Coulomb's second law

5.

The net electrical charge in an isolated system remains constant.

a)

Law of conservation of charge

b)

Coulomb's first law

c)

Coulomb's second law

d)

Law of conservation of energy

6.

Materials whose permeabilities are slightly greater than that of free space.

a)

Paramagnetic

b)

Non-Magnetic

c)

Ferrromagnetic

d)

Diamagnetic

7.

Whos discovered the most important electrical effects which is the magnetic effect?

a)

Hans Christian Oersted

b)

Sir Charles Wheatstone

c)

Georg ohm

d)

James Clerk Maxwell

8.

What is the flux Density of magnetic field whose flux is 3000 uWb and cross-sectional area is 0.25m2?

a)

12,000T

b)

48,000T

c)

0T

d)

More information is needed

9.

What are the effects of moving a closed wire loop through a magnetic field?

a)

A voltage is induced in the wire

b)

A current is induced in the wire

c)

The polarity across the wire depends on the direction of motion

d)

All of the above

10.

What is the magnetomotive force in a 150-turn coil of wire 2 A flowing through it?

a)

13.33 mAt

b)

300 At

c)

74 At

d)

152 At

11.

Which two values are plotted on a B-H curve graph?

a)

Reluctance and flux density

b)

Permeability and reluctance

c)

Magnetizing Force and Permeability

d)

Flux density and magnetizing force

12.

Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13m from each other. Charge on a particle is 3.2 x 10-19 c. Relative permittivity for mica is 5.

a)

1.843 x 10-15N

b)

9.2 x 10-2N

c)

14.41 x 10-9N

d)

None of these

13.

Find the charge in coulombs of dielectric that has a positive charge of 14.5 x 10 to the 18th power protons.

a)

29 x 10 to the 16th Coulombs

b)

14.5 x 10 to the 16th Coulombs

c)

14.5 x 10 to the 18th Coulombs

d)

29 x 10 to the 18th Coulombs

14.

One electron Volt (eV) is equivalent to

a)

1.0 watt-sec

b)

1.6 x 10 ^ -19 watt-sec

c)

1.0 Joule

d)

1.6 x 10^19 joules

15.

The imaginary line representing the electric Field

a)

Electric field

b)

Electric flux

c)

Electric flux density

d)

electric lines of force

16.

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

a)

increases

b)

decreases

c)

remains constant

d)

reaches zero

17.

For a given wirewound core, an increase in current through the coil

a)

reverses the flux lines

b)

decreases the flux density

c)

increases the flux density

d)

causes no change in flux density

18.

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

a)

increases

b)

decreases

c)

remains the same

d)

doubles

19.

When the current through the coil of an electromagnet reverses, the

a)

direction of the magnetic field reverses

b)

direction of the magnetic field remains unchanged

c)

magnetic field expands

d)

magnetic field collapses

20.

There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb

a)

14,400 At/Wb

b)

1,440 At/Wb

c)

9,000 At/Wb

d)

90,000 At/Wb