When a circular coil placed above a current carrying
conductor
Let us assume a circular coil above a current carrying
conductor.Let us assume a case when a constant current is passing
through the conductor. As constant current produce a constant magnetic field,
there is no change in the field. Hence no induced EMF is generated in the
closed coil.
Let us consider one more case where the conductor is carrying
a increasing current. According to right hand thumb rule the direction of
magnetic field around the current carrying conductor is outward. To oppose the
generated magnetic field in the current carrying conductor, an inward magnetic
field is generated in the coil nearby. Thus a clock wise current is generated
in the closed coil.
Let us consider another case where the current in a straight
conductor below the coil is decreasing. This generates a magnetic field inward
and hence the magnetic field in the coil is outward. Thus the current in the
coil is anticlockwise.
In another case let us assume an electron passing through a straight
conductor. Thus the current in it is in the opposite direction. The magnetic
field around it is in the clock wise direction. The induced emf in the closed
coil to oppose it, anti clockwise current and north pole is generated on the
face of the coil.
Motional EMF generated in a straight conductor when it is
moved in a magnetic field with a certain velocity
We can move a current carrying conductor of known length with
certain velocity in a magnetic field.
This rod will experience a force and we can measure it using
the rule that we know all ready. We can also find the direction of the force
experienced by the conductor using the Fleming left hand rule.
We can find the expression for the induced emf and current as
shown in the diagram below.
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