What condition is necessary for the sustained flow of water in a pipe? What anal

Question

What condition is necessary for the sustained flow of water in a pipe? What analogous condition is necessary for the sustained flow of charge in a wire? A difference in water density is needed for water to flow in a pipe. A difference in charge density is needed for charge to flow is a wire A continuous pressure difference, often provided by a pump is needed for water to flow. There is no analogues condition for charge to flow in a wire In both cases, an electrical potential difference, often provided by a battery, is needed for both water and electricity to flow continuously A continuous pressure difference often provided by a pump is needed for water to flow A continuous potential difference, often provided by a battery is needed for charge to flow

Explanation / Answer

A pump is needed to raise water from a region of lower pressure to region of higher pressure, so that a continuous water current is created in a water pipe-line system.In the closed pipe-line ,the water encounters resistance in pipes which slows down the water flow and thus reduces water pressure , which is recouped through work done by pump.

Similarly, electric current is a flow of charges ,which takes place when a battery is used to create a potential diffrence to raise charges from lower potential to higher potential and thus keep a continuous flow in a electrical circuit.

In these two cases the pump and the battery play the same role of doing work to raise from lower level of potential energy to higher level to sustain the current

Hence, answer to this question is the last option.

Student may see: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir.html#c1

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