2.
(CONTINUED)
Q.
The three requirements for producing an emf by electromagnetic induction are:
(1)
a ________________________________________ ,
(2)
a ________________________________________ ,
(3)
and ______________________________________ .
3.
The left hand rule for generators is used to determine the direction of self-inducted emf in a conductor. In
applying this rule, the thumb of the left hand points in the direction of relative motion of the conductor in the
magnetic field . (In this case, the field is moving, which causes the same effect as the conductor moving in
the opposite direction.) The index finger points in the direction of the magnetic field. The middle finger,
extended as shown, will indicate the direction of induce voltage.
Q.
a. When the current in a conductor increases, does the magnetic field surrounding the conductor
expand or collapse?
Q.
b. When the current in a conductor decreases, does the magnetic field surrounding the
conductor expand or collapse?
1-3
IT0353
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