13.
Label the figure below with the polarity of the induced counter emf in the conductor at the instant the switch
is closed.
14.
When a conductor is formed into a coil, a changing magnetic field around one turn of the coil cuts across
adjacent turns, thereby inducing a counter emf in the adjacent turns that, in turn, increases the total counter
emf of the conductor. This action is illustrated below.
Because of this "linkage" between the turns, a coil of wire has more inductance than a straight piece of wire.
The symbol for inductance is "L" (for linkage). When a coil of wire is wound so it has a specific amount of
inductance, it is called an INDUCTOR. Sometimes an inductor is called a choke or a coil.
Q. What is the symbol for inductance?
Q. What is a coil of wire with a specific amount of inductance called?
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IT0353
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