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WorksheetsElectricity and Magnetism
Total questions: 20
Worksheet time: 33mins
Discovered that electric current create magnetic field, which was the first connection found between electricity and magnetism.
Michael Faraday
Hans Christian Oersted
James Clerk Maxwell
Benjamin Franklin
What is the flux density in a magnetic field where the flux for 0.1 square meter is 600μWb?
0.6mT
0.6T
6mT
60mT
In thermal ohm's law, temperature and power loss are analogous to ____ respectively of ohm's law.
V and I
R and V
I and R
I and V
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
Newton's First law
Faraday's first law of electromagnetic induction
Coulomb's first law
Coulomb's second law
The net electrical charge in an isolated system remains constant.
Law of conservation of charge
Coulomb's first law
Coulomb's second law
Law of conservation of energy
Materials whose permeabilities are slightly greater than that of free space.
Paramagnetic
Non-Magnetic
Ferrromagnetic
Diamagnetic
Whos discovered the most important electrical effects which is the magnetic effect?
Hans Christian Oersted
Sir Charles Wheatstone
Georg ohm
James Clerk Maxwell
What is the flux Density of magnetic field whose flux is 3000 uWb and cross-sectional area is 0.25m2?
12,000T
48,000T
0T
More information is needed
What are the effects of moving a closed wire loop through a magnetic field?
A voltage is induced in the wire
A current is induced in the wire
The polarity across the wire depends on the direction of motion
All of the above
What is the magnetomotive force in a 150-turn coil of wire 2 A flowing through it?
13.33 mAt
300 At
74 At
152 At
Which two values are plotted on a B-H curve graph?
Reluctance and flux density
Permeability and reluctance
Magnetizing Force and Permeability
Flux density and magnetizing force
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.
1.843 x 10-15N
9.2 x 10-2N
14.41 x 10-9N
None of these
Find the charge in coulombs of dielectric that has a positive charge of 14.5 x 10 to the 18th power protons.
29 x 10 to the 16th Coulombs
14.5 x 10 to the 16th Coulombs
14.5 x 10 to the 18th Coulombs
29 x 10 to the 18th Coulombs
One electron Volt (eV) is equivalent to
1.0 watt-sec
1.6 x 10 ^ -19 watt-sec
1.0 Joule
1.6 x 10^19 joules
The imaginary line representing the electric Field
Electric field
Electric flux
Electric flux density
electric lines of force
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
increases
decreases
remains constant
reaches zero
For a given wirewound core, an increase in current through the coil
reverses the flux lines
decreases the flux density
increases the flux density
causes no change in flux density
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
increases
decreases
remains the same
doubles
When the current through the coil of an electromagnet reverses, the
direction of the magnetic field reverses
direction of the magnetic field remains unchanged
magnetic field expands
magnetic field collapses
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
14,400 At/Wb
1,440 At/Wb
9,000 At/Wb
90,000 At/Wb
