Practical worksheet 2

Q. No 1: List three sources of magnetic fields.

Ans: Three sources of magnetic fields are:

(a) Permanent magnet 

(b) Electromagnet

(c) Current-carrying conductor

Q. No 2: What is the difference between a permanent magnet and an electromagnet?

Possible Ans: In an electromagnet the magnetic field is created through electric current in a wire-wound coil and strengthened by a soft-iron core. As soon as you turn off the power, the soft-iron core loses its magnetisation.

A permanent magnet is made of ferromagnetic material, which is magnetised by a strong external magnetic field. The magnetically hard material that is used keeps part of its magnetisation after the external magnetic field is turned off.

Q. No 3: What are the different types of artificial magnets?

Possible Ans: They are 1)bar magnet2)horseshoe magnet3)cylindrical magnet 4)solenoid 5)electro magnet 6)permanent magnet

A natural magnet is a magnet that occurs naturally in nature. All natural magnets are permanent magnets, meaning they will never lose their magnetic power. Natural magnets can be found in sandy deposits in various parts of the world. The strongest natural magnet material is lodestone, also called magnetite

The difference is that natural magnets are much more stronger than artificial magnets

Q. No 4: How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain. 

Ans: Solenoid is coil having n number of turns of insulated copper wire. Magnetic field lines are produced around the solenoid when a current is passed through it. The magnetic field produced by it is similar to the magnetic field of a bar magnet. The field lines produced in a current-carrying solenoid is shown in the following figure.

When the north pole of a bar magnet is brought near to the end connected to the negative terminal of the battery, then the solenoid repels the bar magnet. It means the end of solenoid which is connected to the negative terminal of the battery behaves as north pole as like poles repel each other similarly the other and behaves as a south pole.

Q. No 5: What is the difference between magnet and solenoid?

Ans: As nouns the difference between magnet and solenoid is that magnet is a piece of material that attracts some metals by magnetism while solenoid is a coil of wire that acts as a magnet when an electric current flows through it.