## How can two magnets float?

Push a pencil or straw through the hole in your two ring magnets until they come together, or attract. Now remove the top magnet, flip it over, and slide it back over the pencil. It will magically float above (or repel from) the other magnet.

## What happens to the magnetic field when you switch to AC voltage?

Alternating Current (ac) is the type of electricity that we get from plugs in the wall. As the wire rotates in the magnetic field, the changing strength of the magnetic field through the wire produces a force which drives the electric charges around the wire. …

## How do you change polarity?

Reversing The Polarity Of an Electromagnet:

1. Determine the poles of the magnet and mark them accordingly (N=North, S=South)
2. Turn off the power switch.
3. Use a tool (pliers/screwdriver) to disconnect the two wires.
4. Switch the positions of the wires.
5. Turn the power back on and test the polarity.

## What decides its polarity?

The polarity is decided by the direction of current flowing through it. An electromagnet behaves like a magnet as long as current flows through it. Its polarity can be changed by simply reversing the direction of current. Its is much stronger than a permanent magnet.

## What decides polarity of electromagnet?

The polarity of the electromagnet is determined by the direction the current. The direction your thumb is pointing is the direction of the magnetic field, so north would come out of the electromagnet in the direction of your thumb. DC electromagnets are principally used to pick up or hold objects.

## What determines the strength of electromagnet?

Factors Affecting the Strength of the Magnetic Field of an Electromagnet: Factors that affect the strength of electromagnets are the nature of the core material, strength of the current passing through the core, the number of turns of wire on the core and the shape and size of the core.

## Why do we use electromagnets in showers?

Electromagnets are used to make electric power because magnets are a type of electricity,and electro is at the front. That means a lengthy power shower can easily cost you as much as a generous … the water on cold, then keep turning it clockwise to make the water as hot as you wish.

## How much electricity does a shower use?

Electric shower Typically, they will be rated anywhere between 7kW and 10.5kW, making them probably the most expensive thing to run in your house. Even just a 15 minute shower could cost as much as 40p! The best way to control consumption of your electric shower is to reduce the time you spend under the water.