Multiple ChoiceA vertical wire carries a current straight down. To the east of this wire, the magnetic field points:11views
Multiple ChoiceA long, straight wire extends perpendicular to the plane of the screen. If the current in the wire is directed ↑ out of the screen toward you, what is the direction of the magnetic field at a point to the right of the wire?25views
Multiple ChoiceWhat is the magnitude of the magnetic field at a distance r from a long straight wire carrying a current I?33views
Multiple ChoiceWhich of the following equations correctly gives the magnitude of the magnetic field at a distance of 10cm from a long straight wire carrying a current of 1A if the field is measured to be 2μT?35views
Multiple ChoiceAt what distance from a wire carrying a 10A current is the magnetic field strength equal to 50μT? This is the approximate value of the Earth's magnetic field.641views
Multiple ChoiceTypical household wiring in the United States is 14-gauge copper wire which has a radius of 813μm. What is the magnetic field strength inside the wire, halfway between the center and the outside edge, when it is carrying a typical household current of 10A?573views
Multiple ChoiceA wire near the equator carries a current perpendicular to the Earth's magnetic field of 50μT in a location where the field is parallel to the ground and points straight north. Assuming it was of correct magnitude, what direction should the current be in to levitate the wire?658views1rank
Multiple ChoiceA wire near the equator carries a current perpendicular to the Earth's magnetic field of 50μT in a location where the field is parallel to the ground and points straight north. The wire has a mass per length of 5.9g/m. What magnitude of current in the wire could balance it against the force of gravity? (This example is not very realistic. The mass per length given would be reasonable for a very thin wire which could not handle this large of a current for very long.)538views