Q30 of 76 Page 271

What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?

The current carrying wire behaves like a magnet and it will cause deflection of the needle of the compass. This is called magnetic effect of electric current.


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28

What is the advantage of using LED in testing the electrical conductivity of liquids ?

 29

Which effect of electric current is utilized for detecting the flow of current through a solution:

(a) when a torch bulb is used?


(b) when a compass is used?

 31

Explain why, distilled water does not conduct electricity but tap water conducts some electricity.

 32

Distilled water does not conduct electricity. What substances can be added to distilled .water in small amounts to make it a good conductor of electricity? Why?