Q3 (i) (а) Sketch the magnetic field lines produced by a wire carrying a current and uniformly wound around a toroid. The sketch should include the direction of the current and the direction of the magnetic field lines. (b) Calculate the magnetic flux density if a flux of 90 µWb passes through an area of 200 mm². (c) Calculate the flux if a magnetic field of 60 mT passes through an area of 40 cm².
Q3 (i) (а) Sketch the magnetic field lines produced by a wire carrying a current and uniformly wound around a toroid. The sketch should include the direction of the current and the direction of the magnetic field lines. (b) Calculate the magnetic flux density if a flux of 90 µWb passes through an area of 200 mm². (c) Calculate the flux if a magnetic field of 60 mT passes through an area of 40 cm².
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Transcribed Image Text:Q3 (i)
(a)
Sketch the magnetic field lines produced by a wire carrying a
current and uniformly wound around a toroid. The sketch should
include the direction of the current and the direction of the
magnetic field lines.
(b)
Calculate the magnetic flux density if a flux of 90 µWb passes
through an area of 200 mm².
(c)
Calculate the flux if a magnetic field of 60 mT passes through an
area of 40 cm?.
(ii)
Figure 3.1 shows a diagram of a dynamic microphone (ribbon
microphone). With the aid of this diagram briefly explain in your own
words how the microphone works.
Figure 3.1
(ii)
A single conductor of length 60 mm is positioned at a 45° angle to a
magnetic field of density 50 mT. The conductor experiences a force of
100 µN.
(а)
Sketch the conductor with the current and the magnetic field
indicating their vector directions, and the direction of the resulting
force.
(b)
What is the value of the current flowing in the conductor?
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