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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?

The resistivity of an insulator is typically several orders of magnitude greater than that of a metal. This is due to the insulator's low conductivity compared to the high conductivity of metals. The specific difference in resistivity value varies depending on the materials being compared.


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.