give 3 salient features of electromagnet which makes it superior alternative than bar magnet
Answers
Explanation:
Difference between Permanent Magnet and Electromagnet is magnetic field and strength. In Electromagnet, the magnetic field is created by a wire-wound coil but the magnetic field of Permanent (Bar) Magnet cannot be changed. The strength of Permanent Magnet depends on the material used for its creation, on the other hand, the strength of Electromagnet varies according to the flow of electric current into it. Three types of Permanent (Bar) Magnets are Ceramic Magnet, Flexible magnets, Neodymium iron boron magnet, and Samarium cobalt magnet. Each has its own applications and types. Let’s see the more differences between the Permanent Magnet and Electromagnet.
1. a electro magnet can produce very strong magnetic force
2.The strength of an electromagnet can be changed by changing number of turns in the coil or by changing the current passing through it
3.The polarity of an electromagnet can be changed by changing the direction of the current