What are trees? What are trees for?

What are trees?

They are like small living planets as they offer food and shelter to many animals. Human beings obtain from them wood and fruits.

What are trees for?

Trees serve to produce oxygen, they also purify the air, form fertile soils, prevent erosion, keep rivers clean, capture water for aquifers, serve as refuges for fauna, reduce soil temperature, etc.

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trees are plants that grow up in the garden they can grow up to 150 – 210 ft and trees are used for Trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In parts of the world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: