A1m length of wire carrying a current of 7a lies on a horizontal table with a rectangular top of dimensions 0.6m x 0.8m. the ends of the wire are attached to opposite ends of a diagonal of the rectangle. a vertical magnetic field of 0.it is present. what magnetic force acts on this segment of wire? a) 0.7n b) 0.98n c) 7n d) zero

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.