Good Morning!!! Today let us learn about Magnetic attraction.
As you will see from these magnetic experiments, magnetism (the invisible force) can push and pull through some materials such as paper and plastic.
Paper clips are made of steel. If you hold a paper clip close to a magnet, you can feel the magnet pulling on the paper clip with an invisible force called magnetism.
All magnets have two ends or poles (North & South). If you put the poles of two magnets together, they will either pull together or push apart. They will pull (attract) each other if the poles are different. They will push (repel) each other if 
the poles are the same.
Experiments with magnets will help you to find out more about the way magnetism works and how it can be passed on to some other objects.
Look for magnets in old toys or on fridge stickers, or buy a bar or horseshoe magnet from a toy shop.
Electromagnetic relays are devices that connect and disconnect contact points physically using an electromagnet.
The magnetic attraction that activates the relay is generated by the magnetomotive force, which is expressed by the product of coil turns and current.
The operating time can be calculated from the magnetic attraction at the moveable core using an equation of motion.
This example presents the use of a magnetic field analysis to evaluate the operating time of an electromagnetic relay driven by direct current accounting for the eddy currents.
Keep reading and leave your comments.
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