Page 82 - Electric Machinery Fundamentals

!ll) bLbLJ RIC M ACHIN ERY FUNLJAMENTALS

gem gem
~. -"'=+. --- 25em---f-1 5em--r- 25em ---I.!-'-2"-!. l
1_
l
1
1
T
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- i
~-- - -
2A __ -=-= t
- - -=-= 100 turns ~====~--0.05 em 25cm
~
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Core depth = 5 cm
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FIGUREPI-5
The core of Problem 1-8.
1- 9. A wire is shown in Figure Pl-6 that is carrying 2.0 A in the presence of a magnetic
field. Calculate the magnitude and direction of the force induced on the wire.
B =0.5 T,
-----~ to the righl

1= l m

i ==2.0A - FIGURE PI-6
A current-carrying wire in a
magnetic field (Problem 1-9),

1- 10. A wire is shown in Figure Pl-7 that is moving in the presence of a magnetic field.
With the information given in the figure, determine the magnitude and direction of
the induced voltage in the wire.
1- 11. Repeat Problem 1- 10 for the wire in Figure PI- S.
1-12. The core shown in Figure PI-4 is made of a steel whose magnetization curve is
shown in Figure Pl-9. Repeat Problem 1-7, but this time do not assume a constant
value of !-Lr' How much flux is produced in the core by the currents specified? What
is the relative permeability of this core under these conditions? Was the assumption