Question

A soft iron can be made an electromagnet which of the following procedures
would be adopted to test that the soft iron rod has become a magnet-
Place the iron rod near a bar magnet and b. Place the iron rod near
observe if it attracts iron pins.
carrying wire and obse
attracts iron pins
Place the iron rod inside a current carrying d. None of these
solenoid and observe if it attracts iron
pins​

Answer 1

Answer:

An electromagnet is simply a coil of wire.  It is usually wound around an iron core.  However, it could be wound around an air core, in which case it is called a solenoid.  When connected to a current source, the electromagnet becomes energized, creating a magnetic field just like a permanent magnet.   The magnetic flux density is proportional to the magnitude of the current flowing in the wire of the electromagnet. 

The polarity of the electromagnet is determined by the direction of current. The north pole of the electromagnet is determined by using our right hand. If we wrap our fingers around the coil in the same direction as the current is flowing (conventional current flows from + to -). The direction our thumb is pointing is the direction of the magnetic field, so north would come out of the electromagnet in the direction of our thumb. Above is the circuit diagram of an electromagnet.



Explanation:

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