Short answer questions
1. Distinguish between magnetic and
non-magnetic substances.
2. State the law of magnetism.
3. Why are electromagnets temporary magnets?
4. Name two applications of electromagnets.
5. Can a crane use a permanent magnet? Why,
or why not?
Answers
Answer:
2. the law of magnetism is
Explanation:
in physics, Gauss's law for magnetism is one of the four Maxwell's equations that underlie classical electrodynamics. It states that the magnetic field B has divergence equal to zero, in other words, that it is a solenoidal vector field. It is equivalent to the statement that magnetic monopoles do not exist.
Explanation:
1) The materials which get attracted towards a magnet are magnetic – for example, iron, nickel or cobalt. The materials which are not attracted towards a magnet are non-magnetic materials.
2) A basic law of magnetism is that unlike poles attract each other. Two bar magnets can illustrate this. ... A pole of the second is brought, in turn, near each of the two ends of the hanging magnet.
3) An electromagnet is a temporary magnet. It is made by winding a coil of insulated wire round a soft iron core. When a current is passed through the coil, the magnetic field produced by the current magnetises the soft iron core. The soft iron core loses all the magnetism when the current is switched off.
4) Electromagnets are very widely used in electric and electromechanical devices, including:
#Motors and generators.
#Transformers.
#Pickups.
#Relays.
#Electric bells and buzzers.
#Loudspeakers and headphones.
#Actuators such as valves.
#Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks.
5) Cranes uses electromagnets rather than permanent magnets. The electromagnets can get magnetic nature as and when required so that they can lift heavy loads. ... But, in the case of permanent magnets, it is not possible to release the load because the permanent magnets never loses their magnetic property
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