When we blow over a paper strip it goes upward why?

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None of these is a correct reason

Blowing over the paper reduces the air pressure above the strip

Blowing over the paper increases the air pressure above the strip

The strip will not go upward at all

answer is A.

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Detailed Solution

When we blow over a paper strip it goes upward due to high-speed winds. They are always accompanied by air which reduces pressure. It also creates differences in pressure below and above the paper strip. The region below the paper has more pressure than above the strip.

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