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The chemical formula of magneties is ......

The chemical formula of magneties is .......... .

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The correct Answer is:
`Fe_(3) O_(4)`
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FULL MARKS-MAGNETISM AND MAGNETIC EFFECTS OF ELECTRIC CURRENT -ADDITIONAL QUESTIONS SOLVED -III. FILL IN THE BLANKS :
  1. Electromagnets are made of soft iron because soft iron has ..............

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  2. The word 'Magnetism' was derived from Iron are .

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  3. The chemical formula of magneties is .......... .

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  4. The iron ore magnetite was found in the island of .......... .

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  5. .......... Suggested that earth behaves as a giant bar magnet

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  6. The field at the surface of the earth is approximately equal to .........

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  7. The natural magnets have .......... .

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  8. Piecces of iron or steel that acquired magnetic properties when it is ...

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  9. Artificial magnet in the form of a rectangular or cylinderical bar is ...

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  10. In magnet, the magnetic attraction is maximum at the ............. Of ...

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  11. The unit of pole strenghts is .................. .

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  12. The unit of magnetic flu xxdensity is ................

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  13. The value of mu(0) Is equal to ............ .

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  14. A unit pole exxperiences a force of ............. .

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  15. At netutral points the resultant magnetic field due to the magnet and ...

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  16. The circular scale of deflection magneto meter is divided into ..........

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  17. Each quadrant of the circular scale of deflection magnetometer is grad...

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  18. The sensitivity of the deflection magnet meter is more at ........ .

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  19. The magnetic field used to magnetic a material is called the ............

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  20. The unit of magnetic field is

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