HELPP Read this passage from "Iypes of Volcanoes" and
then look at the image.
The color in the center of the diagram most likely
changes from red to orange to
Volcanoes are structures formed around openings
(vents) in the ground where molten lava, ash, or gas
escape from inside the Earth. We have all heard of
lava, but not everyone knows how it forms. Deep
inside the Earth, rock that melted long ago beneath
the Earth's crust forms magma, a very hot liquid that
mixes with dissolved gases and crystals. When this
magma flows up above Earth's surface, it is called
O show the difference between the formation of
O help grab the viewer's attention with more than a
O give a warning with the color red that volcanoes
O show how the temperature of magma changes as it
magma and lava.
single color.
are dangerous.
lava.
rises.

The volcano is constructed layer by layer, as ash and lava solidify, one upon the other (figure 3). ... A cross section of a composite volcano reveals alternating layers of rock and ash: (1) magma chamber, (2) bedrock, (3) pipe, (4) ash layers, (5) lava layers, (6) lava flow, (7) vent, (8) lava, (9) ash cloud.

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: