13. Which is an example of a
magnetic substances ?
O iron
O
nickel
O cobalt
O
all of these
Answers
Answer:
Ferromagnetic metals are strongly attracted by a magnetic force. A ferromagnetic material is one that has magnetic properties similar to those of iron. In other words, you can make a magnet out of it.
The common ferromagnetic metals include iron, nickel, cobalt, gadolinium, dysprosium, and alloys such as steel that also contain specific ferromagnetic metals such as iron or nickel. Ferromagnetic metals are commonly used to make permanent magnets.
so option d. all of these is the correct answer
Answer -:
Option 4 or All of these is the correct answer .
Or Iron , nickel , cobalt , copper etc .... are the magnetic substances.
Extra information -:
A thing which attracts the iron , nickel etc ... things are called magnets.
Magnets are of many types :
(i) Bar magnet
(ii) Horseshoe magnet
(iii) Cylandrical magnet
(i) = A bar magnet is a bar shaped magnet . It is mostly used in experiments and many things .
(ii) = Horseshoe magnet is like the shape of horse shoe . It is the most common magnet .
(iii) = Cylindrical magnet is a circular magnet . They generates very high level of magnetism from a relative small surface pole area .
Magnetic field
Magnetic field is been surrounded whole the earth . It protects us from the solar wind coming from the sun .
Magnetism is the best way to the transport of the trains . It do not do pollution . By this technology we can protect our earth . It is the best way of by which we can travel and also can protect our earth ....