Which of the following will cause a superconductor to have 0 resistance?

You place a box with square faces of side length 4m in a uniform electric field of strength . There is no charge in the box. What is the total electric flux going through the box?

A point charge can be found at the center of a metal box that is isolated, ungrounded, and uncharged. Which of the following statements is true?

If the area of the plates of a parallel plate capacitor is doubled and the distance between the plates is halved, then the capacitance is __________.

Suppose there is an electric field oriented so that its positive terminal points vertically down towards the ground. If a negatively charged particle of mass and charge were placed in the electric field, which of the following expressions gives the electric field strength that would allow the charge to exist in static equilibrium despite the force of gravity?

If a system has 1.4 million electrons, find the net charge of the system.

Suppose that a charge of is moved a distance of from point A to point B while within an electric field. In doing so, of work is done. What is the voltage difference between points A and B?