Question

In the system illustrated by the diagram, the magnetic field is increasing. In which

direction is the induced emf, if any?

Answer 1

The emf will be induced in anti-clockwise direction.

Lenz's law governs the direction of induced current, stating it opposes the change in flux that caused it. This opposition is demonstrated through the right-hand rule, where the forefinger points in the direction of the magnetic field, the thumb indicates the motion of the conductor, and the middle finger signifies the direction of the induced current.

If, for instance, the motion of the conductor aligns with the magnetic field, the induced current will circulate counterclockwise. This concept is integral to electromagnetic induction, revealing the self-regulating nature of induced currents and their tendency to counteract any changes in the magnetic field.

Lenz's law serves as a guiding principle in understanding the dynamic relationship between magnetic fields, induced currents, and the resulting electromagnetic forces.

Answer 2

The emf will be induced in anti-clockwise direction.

Step-by-step explanation

Lenz's law tells us the direction us the direction that the current will flow. It states that the direction is always such that it will oppose the change in flux which produced it. This means that any magnetic field produced by an induced current will be in opposite direction to the change in the original field.

To find the direction of emf, Stretch the forefinger, middle finger and the thumb of the right hand mutually perpendicular to each other. If the force finger points in the direction of the magnetic field, the thumb gives the direction of the motion of the conductor then the middle finger gives the direction of the induced current.