# Testing the Magnetism of a Solenoid & Galvanometer

• handsomecat
In summary, a solenoid with a hollow core connected to a galvanometer and placed between two equidistant magnets with opposite poles (S-N and N-S) will register no current when the magnets are moved at the same speed towards each other into the solenoid's core. This is due to the opposing currents induced by the magnets, resulting in a cancellation of any current in the galvanometer.
handsomecat
suppose you have a solenoid with hollow core connected to a galvanometer.

On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. S pole is nearer to solenoid). ie.

[S - N] [Solenoid] [N - S]

Both magnets are equidistant from the solenoid, and at a distance sufficient for the solenoid to "detect" the magnetic field.

They start moving towards each other at the same speed into the solenoid core and stop at the same time.

My prediction is that there will be absolutely no current shown in the galvanometer. This is because it is impossible to have N poles on both sides of the solenoid to oppose the motion.

As this topic is new to me, is my prediction correct?

handsomecat said:
On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. S pole is nearer to solenoid). ie.

[S - N] [Solenoid] [N - S]

On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. N pole is nearer to solenoid). ie.

[S - N] [Solenoid] [N - S]

handsomecat said:
My prediction is that there will be absolutely no current shown in the galvanometer. This is because it is impossible to have N poles on both sides of the solenoid to oppose the motion.

It is true that you will register no current. The reason is that the two magnets induce exactly opposing currents, which cancel.

## What is a solenoid?

A solenoid is a type of electromagnet that consists of a wire wrapped into a coil, typically cylindrical in shape. When an electric current passes through the wire, it creates a magnetic field.

## How do you test the magnetism of a solenoid?

To test the magnetism of a solenoid, you can use a compass or a magnetometer. Place the device near the solenoid and observe if there is any movement or deflection of the needle. This indicates the presence of a magnetic field.

## What is a galvanometer?

A galvanometer is a device used to measure and detect small electric currents. It consists of a coil of wire suspended in a magnetic field, which moves when an electric current flows through it.

## How does a galvanometer work?

When an electric current passes through the coil of a galvanometer, it creates a magnetic field which interacts with the permanent magnetic field of the device. This causes the coil to rotate, which can be measured and calibrated to determine the strength of the current.

## What is the relationship between a solenoid and a galvanometer?

A solenoid can be used to create the magnetic field needed for a galvanometer to work. The electric current passing through the solenoid will create a magnetic field that interacts with the galvanometer's coil, causing it to move and measure the current. Therefore, a solenoid and a galvanometer are often used together in experiments and electrical circuits.

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