Q8 of 24 Page 369

Why it necessary to connect an earth wire to electric appliances having metallic bodies?


An electric appliance having metallic body can have current leak and current may flow through its body. It can be fatal if a person touches its current carrying metallic body. So, it must be connected to an earth wire to pass the extra current, flowing through its body, to the earth plate.

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Name the phenomenon which is made use of in an electric generator.

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What change should be made in an AC generator so that it may become a DC generator?

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A student while studying the force experienced by a current-carrying conductor kept in a magnetic field records the following observations:

i. The force experienced by the conductor increases as the current is increased.


ii. The force experienced by the conductor decreases as the strength of the magnetic field is increased.


Which of the two observations is correct and why?

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Copy and complete the diagrams to show the shape and direction of the magnetic field between the magnetic poles.