5. What are electromagnets? Write the difference between electromagnets and permanent magnets
Answers
Answer:
The three objectives of a secular State are stated below: (i)One religious community does not dominate another. (ii)Some members do not dominate other members of the same religious community. (iii)The State does not enforce any particular religion nor does it take away the religious freedom of individuals.
Parameter Electromagnet Permanent magnet
Definition Forms when current passes through a ferromagnetic material. Forms by heating a material which has inbuilt magnetic properties.
Strength Depends on the current flow. Can produce a strong magnetic field. Depends on the nature of the material used for creation. Relatively weaker field.
Magnetic properties Can be altered using current. Once magnetic properties are lost, it becomes useless.
Material Soft material used Hard material used
Field stability Requires a continuous supply of current for a magnetic field. No requirement of current to maintain its field effect.
Poles Alteration of Poles is possible by changing coil direction Alteration of the Poles is not possible.
Example Solenoid. Bar magnet
coercivity Low High