Question

Use lenz's law to determine the direction of induced current in each case

Answer 1

Answer:

In electromagnetic induction, emf can be defined around a closed loop of conductor as the electromagnetic work that would be done on an electric charge (an electron in this instance) if it travels once around the loop.[5] For a time-varying magnetic flux linking a loop, the electric potential scalar field is not defined due to a circulating electric vector field, but an emf nevertheless does work that can be measured as a virtual electric potential around the loop.[6]

In the case of a two-terminal device (such as an electrochemical cell) which is modeled as a Thévenin's equivalent circuit, the equivalent emf can be measured as the open-circuit potential difference or "voltage" between the two terminals. This potential difference can drive an electric current if an external circuit is attached to the terminals.

Explanation:

Here, the direction of magnetic field is

Here, the direction of magnetic field isperpendicularly inwards to the plane of paper. If a wire of irregular shape turns into a circular shape, then its area increases (v the circular loop has greater area than the loop of Irregular shape) so that, the magnetic flux linked also increases. Now, the induced current is produced in a direction such that it decreases the magnetic field [i.e. the current will flow in such a direction, so that the wire forming the loop is pulled inward in all directions (to decrease the area)], i.e. current is in anti-clockwise direction,

Here, the direction of magnetic field isperpendicularly inwards to the plane of paper. If a wire of irregular shape turns into a circular shape, then its area increases (v the circular loop has greater area than the loop of Irregular shape) so that, the magnetic flux linked also increases. Now, the induced current is produced in a direction such that it decreases the magnetic field [i.e. the current will flow in such a direction, so that the wire forming the loop is pulled inward in all directions (to decrease the area)], i.e. current is in anti-clockwise direction,i. e. along adcba.

Here, the direction of magnetic field isperpendicularly inwards to the plane of paper. If a wire of irregular shape turns into a circular shape, then its area increases (v the circular loop has greater area than the loop of Irregular shape) so that, the magnetic flux linked also increases. Now, the induced current is produced in a direction such that it decreases the magnetic field [i.e. the current will flow in such a direction, so that the wire forming the loop is pulled inward in all directions (to decrease the area)], i.e. current is in anti-clockwise direction,i. e. along adcba.(ii) When a circular loop deforms into a narrow straight

Here, the direction of magnetic field isperpendicularly inwards to the plane of paper. If a wire of irregular shape turns into a circular shape, then its area increases (v the circular loop has greater area than the loop of Irregular shape) so that, the magnetic flux linked also increases. Now, the induced current is produced in a direction such that it decreases the magnetic field [i.e. the current will flow in such a direction, so that the wire forming the loop is pulled inward in all directions (to decrease the area)], i.e. current is in anti-clockwise direction,i. e. along adcba.(ii) When a circular loop deforms into a narrow straightwire, the magnetic flux linked with it also decreases. The current induced due to change in flux will flow in such a direction that it will oppose the decrease in magnetic flux, so it will flow anti-clockwise, i.e. along adcba due to which the magnetic field produced will be out of the plane of paper.