What will this loop oppose?
A loop is placed in the plane of an infinite current-carrying wire, as shown in the diagram.
The current in the wire varies as . What will be the direction of induced current in the loop?
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1 solution
The direction of the magnetic field produced by the current carrying wire can be found out using the right hand rule. It will come out to be into the plane of the loop. Therefore, due to the current in the wire, there will be a magnetic flux (going into the plane of the loop) linked with the loop. As the current changes with time, this magnetic flux crossing the loop also changes.
According to the Lenz's law , an emf is induced in the loop in such a way that to oppose its own cause.
According to the equation of the current, the current is decreasing and hence the magnetic flux through the loop is decreasing. The induced emf will oppose this decrease in the magnetic flux and hence the induced emf/current will be in the clockwise direction.