The earth's magnetic field, with a magnetic dipole moment of 8.0 x 1022 A m², is generated by currents within the molten iron of the earth's outer core. Suppose we model the core current as a 3000-km-diameter current loop made from a "wire." The loop diameter is 1000-km-diameter measured from the centers of this very fat wire.

Two wires are separated by a distance of 5.0 cm and one carries a 11.0 A current up while the other carries a 9.5 A current down. If the wires are 1.2 m long then what is the force that each wire exerts on the other and is the force attractive or repulsive?

A singly charged ion (an ion missing one electron) with a velocity of 7,642 m/s is injected perpendicular to a 0.277 T magnetic field, and the ion moves in a circle of 66.8 mm radius. What is the molar mass of the ion in grams? (Remember to use grams and Avogadro's number to get molar mass. State the answer as an integer with no unit.) Moving to another question will save this response. Question & of a

Consider a long, horizontal Large Wire with current of 10 A running through it. We want to levitate a horizontal, thin, 0.50 m length of wire above it. If the thin wire has a mass of 10 grams, and a current of 300 mA, how far above the Large Wire will it hover (net force of zero) due to magnetic and gravitational forces? A. If the thin wire hovers above the Large Wire due to their magnetic fields, are their currents going the same direction, or opposite directions. Explain. B. Draw a diagram and label the directions of currents, and all other relevant quantities and vectors. C. Find the distance above the Large Wire the small thin wire will hover (net force of zero). D. Would your answers to parts A and C change if we wanted to find a distance below (rather than above) the Large Wire that the smaller thin wire could hover, due to their magnetic fields. Explain. Don't calculate any values but draw a new diagram and explain how this situation compares to the problem above.

MYMIVIVH uns w pui SIVIN IN WEHE saw piwa ISMIMIN 29. An electron is travelling at 100 km/s parallel to a long straight horizontal conductor a distance of 3.00 cm from the conductor. A current of 12.0 A runs through the wire as the electron travels parallel to it, in the same direction as the electron's velocity. Find the strength of the external electric field that will prevent the elec- tron from deviating from its original path. Express your answer in V/m.