earth magnetic field ?

Question

ok, so how do you calculate the Earth's magnetic field using a compass and a current loop?

What formula do you use?

Answer 1

There's more to it than unit conversion. You'll need to use the Biot-Savart law to determine the magnetic field in the center of a thin round current loop of the given radius as a function of ampere-turns. When the needle reverses direction with the compass is placed in the center, you'll know that the field is just barely past being canceled. Now lower the current slowly until the need flips back north. Taking the average of the two currents at the two flips compensates for the needle's static friction. Take lots and lots of data and average. Don't forget error analysis! The grader will love that.

Answer 2

Orient the loop and its direction of current flow to oppose the local field in direction and declination. Insert the compass within the loop and ramp up the amperage. When you have a sufficient number of ampere-turns to equal and oppose the ambient magnetic field the compass needle will no longer orient.

Do unit conversion to anything you like. How many ampere-turns is 0.4 gauss?

Answer 3

the sector is such as that of a bar magnet, yet this similarity is superficial. The magnetic container of a bar magnet, or the different variety of everlasting magnet, is created with the aid of the coordinated spins of electrons and nuclei interior of iron atoms. The Earth's middle, although, is warmer than 1043 ok, the Curie element temperature at which the orientations of spins interior of iron develop into randomized. Such randomization motives the substance to lose its magnetic container. hence the Earth's magnetic container is brought about not with the aid of magnetized iron deposits, yet extra often than not with the aid of electric powered currents interior the liquid outer middle (because it spins, electrons tend to stay at the back of, thus producing a small present day). yet another function that distinguishes the Earth magnetically from a bar magnet is its magnetosphere. At super distances from the planet, this dominates the exterior magnetic container. electric powered currents brought on interior the ionosphere additionally generate magnetic fields. any such container is often generated close to the place the ambience is closest to the solar, inflicting on an primary basis variations that may deflect floor magnetic fields with the aid of as much as a minimum of one degree.