Acircuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in the figure below. an external magnetic field is directed perpendicular to the plane of the circuit. which of the following actions will make the bulb light up? (select all that apply.)

the bar is moved to the left.
the bar is moved to the right.
the magnitude of the magnetic field is increased.
the magnitude of the magnetic field is decreased.
the bar is lifted off the rails.

Acertain half-reaction has a standard reduction potential e_red^0 = -0.94 v. an engineer proposes using this half-reaction at the cathode of a galvanic cell that e must provide at least 1.00 v of electrical power. the cell will operate under standard conditions. a. is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have? b. is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have?