Q12 of 84 Page 288

Why should a person not stand under a tree during a thunderstorm?

Trees are usually the tallest objects around and have many pointy tips. The electric field is strong near the pointed tips. The current from a lightening may leave the tree and jump over to the person standing near the tree. The current will then follow from the body of the person on its way to the ground.


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10

When an object is touched with the metal top of an electroscope, its aluminium leaves diverge. What conclusion do you get from this observation?

 11

What name is given to the flash of light which occurs in the sky during the rainy season?

 13

Name the scientist who showed that lightning is electric in nature.

 14

Name the device which is used to protect a tall building from lightning.