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Q. A tube of radius 5cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×10^5 Pa. The density of water is 1000kg/m3. Suppose that the water is no viscous and uncompressible.

Q. At the present, to find out the current cutting through the path: each loop carries the same current I, and some number N of loops cut through the path, so total current is NI. Rewrite N in terms of the number of turns per unit length (n) and the physical dimensions of the path.

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