Question

To maintain a steady current through the conductor, some external device must do work. What does the external device provide?

(a) Inductance

(b) Capacitance

(c) Potential difference

(d) Electromotive force

I got this question during a job interview.

I'm obligated to ask this question of Electric Currents in Conductors in section Current Electricity of Physics – Class 12

Answer 1

Right answer is (d) Electromotive force

For explanation I would say: To maintain steady current through the conductor, electromotive force must be provided by the external device to take positive charge from lower potential to higher potential i.e. in the direction opposite to that of the electric field.