Which of the following is a true statement regarding electron beams? electron beams have so little mass that they are unaffected by magnetic fields. ernest rutherford used electron beams to study electromagnetic fields in the late 19th century. the velocity of an electron is equal to the ratio of the electric field to the magnetic field. in a cathode-ray tube, a picture is produced by electric fields interacting with an electron beam.

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.