Why do electric charges that move through a magnetic field produce an electric current? A. The magnetic field exerts a force on only the negative charges in the wire. B. The magnetic field pushes negative charges and positive charges in opposite directions. C. The magnetic field pushes negative charges and positive charges in the same direction. D. The magnetic field exerts a force on only the positive charges in the wire.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.