# North Pole Entering a coil wound counterclockwise

• COOLMAN09
In summary, the conversation discusses the relationship between electricity and magnetism, specifically in terms of polarity and the direction of current flow in coils wound counterclockwise. It is mentioned that a change in magnetic field induces an opposing electric current, and that a north pole entering a counterclockwise coil will induce a north pole, while a north pole exiting will induce a south pole. The relationship between poles and windings in electromagnets can be found online. It is also important to consider the direction of current flow in relation to the direction of winding in the coil.
COOLMAN09
Electricity and Magnetism (Polarity)

## Homework Statement

Draw and indicate the current flow for the following situtions

a) A north pole entering a coil wound counterclockwise

b) A north pole exiting a coil wound counterclockwise

Also is you could please explain coils, and clockwise and counterclockwise and them realating to coils. Thanks in advance

Last edited:
Welcome to PF;
You should really show us how you are thinking about this problem - what resources you have tried in sorting out your ideas - that kind of thing.

The rule you are looking for is this:
The change in magnetic field induces an electric current whose own magnetic field opposes the change.

Thus - the coil will try to make an electromagnet to oppose the motion of the permanent magnet. Thus - a north pole approaching induces a north pole, and a north pole leaving induces a south pole.

The relationship between the poles and the windings of an electromagnet are available online: eg.

... you have to be careful about which way the current goes in relation to which way the wire is wound on the coil ... trace how the current has to flow through the wire to see.

## 1. What is the significance of entering a coil wound counterclockwise at the North Pole?

The direction in which a coil is wound can affect its properties, such as its inductance and magnetic field. At the North Pole, the Earth's magnetic field lines are directed downward, so by entering a coil counterclockwise, the coil will align with the magnetic field and produce a stronger magnetic field.

## 2. How does entering a coil wound counterclockwise at the North Pole impact its inductance?

Entering a coil counterclockwise at the North Pole increases its inductance. This is because the coil's magnetic field will align with the Earth's magnetic field, creating a stronger magnetic field and thus increasing the coil's inductance.

## 3. Does entering a coil wound counterclockwise at the North Pole affect its direction of current flow?

Yes, entering a coil counterclockwise at the North Pole will reverse the direction of current flow. This is because the Earth's magnetic field lines are directed downward at the North Pole, so the coil's magnetic field will oppose this and cause the current to flow in the opposite direction.

## 4. Can entering a coil wound counterclockwise at the North Pole impact its efficiency?

Yes, entering a coil counterclockwise at the North Pole can improve its efficiency. By aligning the coil's magnetic field with the Earth's magnetic field, the coil will produce a stronger magnetic field and require less energy to generate the same amount of magnetic flux. This results in improved efficiency.

## 5. Are there any other factors to consider when entering a coil wound counterclockwise at the North Pole?

Yes, the diameter and size of the coil can also play a role in its behavior when entering it counterclockwise at the North Pole. A larger diameter coil will be more affected by the Earth's magnetic field, whereas a smaller diameter coil may not experience as much of an impact. It is important to consider these factors when designing and using coils in this manner.

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