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If we speak in terms of electrical conductivity, some good insulators are ceramics, plastics, rubber and glass. Conductors are, on the other hand, metals in general: copper, silver, gold, but there are some good conductors that are not metals, like graphite and some salt solutions.

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What happens to the compass needle in Figure 7-11 when the current through the conductor is reversed?

When the current through the conductor is reversed, the magnetic field around the conductor will also reverse. As a result, the compass needle in Figure 7-11 will deflect in the opposite direction compared to when the current was flowing in the original direction.


What is the resistivity and the conductivity of aluminum?

The resistivity of aluminum is approximately 2.65 x 10^-8 ohm meters, and its conductivity is approximately 3.77 x 10^7 siemens per meter. Aluminum is a good conductor of electricity due to its high conductivity.


What has 7 electrons in their outer energy level?

Atoms of elements in Group 7A of the periodic table, also known as Group 17 or the halogens, have 7 electrons in their outer energy level. Examples of elements in this group include fluorine, chlorine, bromine, iodine, and astatine.


How many times is the resistivity of an insulator greater than a metal?

That depends on the specific material of the insulator versus the specific material of the metal. But the answer is easily in the millions. This is your lucky day! Just for you, today, we're having a special. I went and found a list with actual numbers and everything, and I compared glass with copper. Depending on the composition of the glass, the ratio of resistivities is between 5.95 billion billion and 5.85 thousand billion billion. I have to thank you for posting this question, because I've never looked at a list of these before, and I found some more interesting comparisons. (The actual numbers are down at the bottom.) -- Silver, the best conductor by just a bit, has 5.4% less resistivity than copper. -- Gold . . . 45.2% greater resistivity than copper -- Iron . . . 4.1 times the resistivity of Gold, 6.0 times that of Copper -- Lead . . . 2.2 times the resistivity of Iron, 13.1 times that of Copper -- Nichrome, the resistor wire used for the heating coil in a toaster . . . 5 times the resistivity of Lead, 65.5 times that of Copper -- Teflon . . . 1 billion to 10 thousand billion times the resistivity of Glass, 5.95 million trillion trillion to 5.95 hundred million trillion trillion times that of Copper ==================================== Silver. . . . . 1.59 x 10-8 ohm-meter Copper . . . 1.68 x 10-8 Gold. . . . . . 2.44 x 10-8 Iron . . . . . . 1.0 x 10-7 Lead . . . . . 2.2 x 10-7 Nichrome . . 1.1 x 10-6 Glass . . . . . 1011 to 1014 Teflon. . . . . 1023 to 1025


What are examples of objects that weigh 7 grams?

Some examples of objects that weigh around 7 grams include a US nickel coin (which weighs 5 grams), a paperclip, or a standard AAA battery. These items are commonly used for reference when measuring small weights, as they are close to the 7-gram mark. It's important to note that the exact weight of these objects may vary slightly due to factors such as wear and tear or manufacturing differences.