Chapter 20 - Electromagnetism - 5


1. Force acting upon the conductor is _______, only when it is placed at right angle to the field.


2. Current can only pass through a ________.


3. Two equal but opposite forces from a _______ of forces.


4. DC motor converts the electrical energy into _________ energy.


5. A galvanometer is used to measure _________.


6. The number of magnetic lines of force passing through any surface is known as magnetic _______ through that surface.


7. If the magnetic flux through a coil or solenoid is changing, an _____ is induced in it .


8. The mangnitude of induced emf in a coil depends upon the _______ of relative motion.


9. In1831, Michael Faraday discovered the phenomenon of ___________.


10. When a coil rotates in a magnetic field the flux passing through it continously __________.


11. In AC generator, rotation of the coil in a magnetic field generates an ______ induced emf.


12. When current is passed through a galvanometer its needle is ________.


13. The number of lines of force in a megnetic field depends upon the _______ of the field.


14. A stronger field has _________ lines than a weaker one.


15. Transformer is a device used to increase or decrease the value of alternating __________.


16. A rectangular _____ rotates between permanent magnet in a generator.


17. A rectangular _____ rotates between permanent magnet in a generator.





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