1) Roland has built a circuit, and is using a device called an ammeter to measure how quickly electrical current is flowing through the circuit. He calculates that the current should be 0.1800.180 amps, but he measures the current as 0.1730.173 amps. What is Roland's percent error? 2) Two objects have masses of 1.1551.155 kg and 0.220.22 kg, respectively. Using the correct number of significant figures, what is the sum of these masses? 3) Kwame is measuring the dimensions of a box he will be using in a coming experiment. He measures the dimensions of the box as 0.8850.885 meters wide 0.200.20 meters deep, and 0.750.75 meters tall. Using the correct number of significant figures, what is the volume of this box? please try to answer as many questions as you can, thank you.

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0