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Biology; Chemistry; Physics: Post your doubts here!

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Can some one plssssss tell me the answer of these two questions first is mercury barometer taken frm 1 floor to 4 floor the height of mercury column decreases answer is
Air pressure increased
I don't get itisnt it suppose to be decrease ???????:-/:-/
 
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Second question is how do we find direction of compAss current carrying straight wire pppllllsssss help
 
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Can some one plssssss tell me the answer of these two questions first is mercury barometer taken frm 1 floor to 4 floor the height of mercury column decreases answer is
Air pressure increased
I don't get itisnt it suppose to be decrease ???????:-/:-/

The internal liquid pressure and the external atmospheric pressure determine the height of liquid column. Think of it this way . Two boys are pushing each other but neither moves for hours . Suddenly one falls backwards . What does this mean? It's obvious that this fallen boy is now weaker then the other boy .
Same is the case in this question . Atmospheric pressure increases and becomes more powerful and pushes the liquid downwards . While the weaker internal pressure is not able to prevent this.
Thus , the answer is correct
Hope This Helped .

Second question is how do we find direction of compAss current carrying straight wire pppllllsssss help
the Right Hand Rule :
Point the thumb of your right hand in the direction of the current . Curl your four fingers . The direction your fingers appear to move while curling is the direction a compass points to when placed near a current carrying conductor (wire)
 
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