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What are magnetic field lines ? How is t...

What are magnetic field lines ? How is the direction of a magnetic field at a point determined ?

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A magnetic field line is the path along which a unit north pole tends to move. The direction of a magnetic field is determined by placing a small compass needle . The direction of deflection of the north pole of the compass needle gives the direction of the magnetic field at the point.
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ZEN PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT -Additional question section (Short answer [SA] type 1 questions)
  1. Give two uses of a magnetic compass.

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  2. A freely suspended magnet always points along north-south direction. W...

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  3. What are magnetic field lines ? How is the direction of a magnetic fie...

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  4. What is the direction of magnetic field lines inside a bar magnet and ...

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  5. What does the degree of closeness of the field lines represent ?

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  6. Name the SI unit of magnetic field and define it.

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  7. Identify the poles of the magnet in the given Figures.

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  8. In the Figure, identify the poles marked P and Q as north pole or sout...

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  9. Why does a current-carrying conductor experience a force in a magnetic...

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  10. It is established that an electric current through a conductor produce...

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  11. A magnetic compass shows a deflection when placed near a current-carry...

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  12. A horizontal power line carries a current from east to west direction....

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  13. What would happen to the direction of rotation of a motor, if i] t...

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  14. How can the speed of rotation of the armature coil of an electric moto...

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  15. Draw the diagram of a simple electric motor. Label the following parts...

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  16. In what way can the magnitude of an induced current be increased ?

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  17. State the factors on which the induced emf in a coil rotating in a uni...

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  18. If the speed of rotation of the armature of a generator is doubled, ho...

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  19. For the current-carrying solenoid shown, draw the magnetic field lines...

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  20. What kind of energy transformation takes place in an electric motor ? ...

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