17 Questions
What happens if the flux linking a coil changes?
An emf is induced in the coil
How can the flux linking a coil be changed?
By changing the size of the coil
According to Lenz's Law, what is the direction of the induced emf when the current through a coil increases?
It opposes the increase in current
What does the equation e = dΦ / dt represent?
Change in flux with respect to time
How is flux linkage calculated for an 'N' turns coil?
'N' multiplied by flux
What is the torque experienced by a current-carrying coil when placed in a uniform magnetic field?
$T = pm xB$
What is the magnetic moment of a coil with 'n' turns carrying current 'i' and area 'A'?
$pm = NiA$
In the context of magnetic fields, what does the permeability in a vacuum represent?
Ability of a material to be magnetized
What is the relationship between the current 'i' and the magnetic field 'B' according to the right-hand screw rule?
'i' and 'B' are mutually perpendicular
How is the magnetic moment 'pm' related to the area 'A' and current 'i' of a loop?
$pm = iA$
What is the formula for the magnetic force 'F' experienced by an elementary length of conductor 'dl' carrying current 'i' in a magnetic field 'B'?
$F = dq(dl / dt)B$
What is the relationship between magnetic flux density (B) and magnetic field intensity (H) in a vacuum?
B = µo H
Which physical property is intermediate between electric currents and flux density when considering magnetic flux produced by electric currents?
Magnetic field intensity (H)
What does Ampere’s Circuital Law relate to magnetic flux intensity (H) and the current producing it?
Current density at any point in the conductor
If a closed path around a current-carrying conductor is a circle of radius r, what is the expression for the magnetic field intensity (H)?
H = i / 2Πr
Which statement is true about the relationship between vectors B and H?
Vectors B and H are co-linear.
What does magnetic flux in a vacuum depend on?
Permeability of the vacuum
Test your knowledge on the relationship between magnetic field intensity (H) and flux density (B) in the context of magnetic flux production. Learn about the physical property that exists between current and flux density, as well as how electric currents and permanent magnets contribute to magnetic flux.
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