When a charged body is brought close to an uncharged body without touching it, a(n charge may result on the uncharged body. when a charged body is brought into contact with an uncharged body and then is removed, a(n charge may result on the uncharged body.
a. negative; positive
c. induced; residual
b. positive; negative
d. residual; induced?

The correct answer is C. induced; residual

Explanation:

Going by the law of charges which states that like charges repel and unlike charges attract, we can explain the induction of charges which is one of the methods to charge an object. In the question, it was not stated what kind of charge the charged body has, whether it is positively or negatively charged. However, the induction process can be explained irrespective of the type of charge the initial charged body has. In this explanation, I will assume the charge body is negatively charged.

If a negatively charged body is brought close to an uncharged (neutral) body without touching it will induce polarity on the uncharged body. For sake of clarity, we will refer to the negatively charged body as object 1 and the uncharged body as object 2. The negatively charged body will repel electrons in object 2 closer to it, to the other end of the body thus creating polarity within the uncharged body. There is an excess of positive charge on one side of object 2 and an excess of negative charge on the other side but the overall charge in object 2 remains neutral (the number of protons and electrons remains the same). Then, another charged body which we will now refer to as object 3 is brought in contact with object 2 to ground it. The touching of object 2 by object 3 allows the excess electrons to flow into object 3 leaving a residual positive charges,making object 2 to become positively charged. Upon removal of object 1, object 2 now becomes permanently, positively charged.

The charge received by an object (in this case object 2) is usually opposite to the charge of the object (in this case object 1) that was used to charge it.

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-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

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hope this