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*37.
mmh A circular loop of wire rests on
a table. A long, straight wire lies on this loop, directly over its center,
as the drawing illustrates. The current I
in the straight wire is decreasing. In what direction is the induced current,
if any, in the loop? Give your reasoning. |
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The current in the wire will
create a magnetic field above the wire that is coming out of the paper and
below wire the magnetic field will be into the
paper. Now as you move away from the
wire, the field strength will decrease, but since the wire is in the center
of the loop, the field above the wire will always equal the field below the
wire and the net magnetic field through the coil will be zero, even as the
current decreases. Since there is no
net magnetic field, there is no magnetic flux and therefore no induced
current! |
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