What can you infer about the earth’s interior from the fact that earth has a magnetic field?
magnetic field is believed to be generated deep down in the Earth’s core. Right at the heart of the Earth is a solid inner core, two thirds of the size of the Moon and composed primarily of iron. At a hellish 5,700°C, this iron is as hot as the Sun’s surface, but the crushing pressure caused by gravity prevents it from becoming liquid.
Surrounding this is the outer core, a 2,000 km thick layer of iron, nickel, and small quantities of other metals. Lower pressure than the inner core means the metal here is fluid.
Differences in
temperature, pressure and composition within the outer core cause
convection currents in the molten metal as cool, dense matter sinks
whilst warm, less dense matter rises. The Coriolis force, resulting
from the Earth’s spin, also causes swirling whirlpools.
This flow of liquid iron generates electric currents, which in turn
produce magnetic fields. Charged metals passing through these
fields go on to create electric currents of their own, and so the
cycle continues. This self-sustaining loop is known as the
geodynamo.
The spiralling caused by the Coriolis force means that separate
magnetic fields created are roughly aligned in the same direction,
their combined effect adding up to produce one vast magnetic field
engulfing the planet
What can you infer about the earth’s interior from the fact that earth has a magnetic...
From known information about the Earth’s orbit around the Sun, calculate the speed of the Earth as it orbits the Sun. (Hint: You will need to look up the distance from the Earth to the Sun in meters). Choose the answer closest to your calculated result.
the earth’s magnetic field is about 50 µT, at a 60° dip angle. If your textbook is resting on the table, what is the downward flux through the cover of the book?
The earth can be considered as a conducting sphere of average net charge -500,000 C. The average radius of the earth is about 6400 km. a. Calculate the magnitude and direction of the electric field just outside the surface of the earth. b. What is the electric field at a depth of 8 km ( 5 miles) below the surface of the earth? c. The earth’s atmosphere contains +500,000 C of net charge. What would be the electric field outside...
What is the source of the Earth’s magnetic field in regard to dynamo theory, inner core, outer core, convection, and rotation? Who discovered the Earth’s magnetic field periodic reversals and How did they discover it? What is the current best theory of its cause? How does the magnetosphere interact with charged particles in the solar wind? What happens to a planet without a planetary magnetic field, like Mars?
You want practically no magnetic field in a small region of space, not more than 10% of Earth’s magnetic field at that location. The Earth’s magnetic field line is angled downward 72.7 degrees into the earth but practically due north. The field strength is 55.66 microTesla a. Take a single wire and make a loop with it with a radius of 80 cm. Put your small apparatus right at the origin of this loop. This will work because it is...
Suppose you wanted to use Earth’s magnetic field to make an ac generator at a location where the magnitude of the field is 0.05000 mT. Your coil has 1008 turns and a radius of 3.700 cm. At what angular velocity would you have to rotate it in order to generate an emf of amplitude 1.000 V?
Suppose you wanted to use Earth’s magnetic field to make an ac generator at a location where the magnitude of the field is 0.05000 mT. Your coil has 1062 turns and a radius of 3.600 cm. At what angular velocity would you have to rotate it in order to generate an emf of amplitude 1.400 V?
#2 near the ground at the north magnetic pole, the earth’s magnetic field is directed downward vertically and has a strength of 0.57 G. An electron at the north pole is projected from the ground into this magnetic field with a velocity of 1.4 km/s vertically upward and 1.9 km/s horizontally to your right. A) find the magnitude of the force acting on this electron B) find the electron’s acceleration (magnitude and direction)
The earth’s magnetic field is approximately 0.000050 T. What is the energy in 1.1 m3 of that field? x 10-3
At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green turtles seem to use this dip angle to determine their latitude. Suppose you are a researcher wanting to test this idea. You have gathered green turtle hatchlings from a beach where the magnetic field strength is 50 μT and...