When you put your dirty pennies in the vinegar and salt, the copper oxide and some of the copper dissolve in the water. That means some copper atoms leave the penny and start floating around in the liquid.
here are the list why electromagnet is important. it has several purposes.
uses in home appliances
most of the electric appliances used in the home use electromagnetism as the basic working principle. some electromagnet uses in the home includes electric fan, electric doorbell, induction cooker, magnetic locks, etc. in an electric fan, the electromagnetic induction keeps the motor rotating on and on making the blade of the fan to rotate. also in an electric doorbell when the button is pressed, due to the electromagnetic forces the coil gets energized and the bell sounds.
uses in medical field
the uses of electromagnets are also seen in the medical field. mri scan which is short for magnetic resonance imaging is a device which uses electromagnets. the device can scan all the tiny details in the human body with the help of electromagnetism.
uses in memory storage devices and computer hardware
the data in ebook gadgets and phones are stored in the electromagnetic format in the form of bytes and bits. the computer hardware is also having a magnetic tape which works on the principle of electromagnetism. even in the olden days’ electromagnets had a huge role in the data storage of vcp and vcr.
uses in communication devices and power circuits
without electromagnets, the mobiles and the telephones we use to make phone calls over long distance could not have taken shape. the electromagnetic pulses and the interaction of the signals make the mobiles and telephones very handy.