Question

A bar magnet is moved in the direction indicated by the arrow between two coils $PQ$ and $CD$. Predict the directions of induced current in each coil.

Answer 1

Hint: All matter exhibits magnetic properties once placed in an external magnetic flux. Even substances like copper and atomic number thirteen that is the aluminum that doesn't seem to be commonly thought of as having magnetic properties are littered with the presence of a magnetic flux like that created by either pole of a magnet.

Complete step by step solution So in this question, we have to predict the induced current in the coil. So for this, we have a bar magnet that is being moved in the direction shown by the arrow between the two coils which is the name as $PQ$ , $CD$.
This can be understood by Lenz’s law: It states that the polarity of the emf induced in the circuit opposes the change in the magnetic flux and this is responsible for the production of it.
As shown in the figure, if the magnet will move to the side of the left then there will be $CD$ some changes and that changes will be like, the magnetic field through the $PQ$ coil will get reduced in the left direction. So from this, we can say that the flow of current is coil $PQ$ is from $Q$ to $P$.
Similarly in the coil, the magnetic field is increasing in the left direction. And this will tell us that the current flowing in the $CD$ coil is from $C$ to $D$.

Note: The direction of the flux is tangent to the field line at any purpose in space. A little compass can point within the direction of the field line. It’s specifically proportional to the number of lines per unit area perpendicular to the lines (called the region density). Magnetic field lines will ne'er cross, which means that the field is exclusive at any purpose in space. Magnetic field lines are continuous, forming closed loops while not starting or finishing. They’re going from the North Pole to the South Pole.