| The diagram shows a simple mercury barometer. The mercury level is at a height h when the atmospheric pressure is 100000 Pa. |
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| What is the pressure at P? |
A) 40000 Pa
B) 60000 Pa
C) 100000 Pa
D) 140000 Pa
Correct Answer: B
Solution :
One common error is to think that the pressure at 0.4 h above the surface of the reservoir of mercury is 0.4 times the atmospheric pressure. The pressure at P is caused by the weight of the mercury above point P. The pressure at P \[\text{= 0}\text{.6}\times \text{100000 = 60000 Pa}\]
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