Which of the following describes an experiment that demonstrates that there are

Question

Which of the following describes an experiment that demonstrates that there are at least two different types of electric charge? Select One of the Following: (a) Rub one pair of rods made of the same material for example, glass - with felt. Observe that the glass rods repel one another. (b) Charge a pair each of glass and rubber rods by rubbing them with felt. Observe that that (1) the glass rods repel each other, (2) the glass rods attract the rubber rods, and (3) the rubber rods repel each other. (c) Charge a pair each of glass and quartz rods by rubbing them with felt. Observe that that (1) the glass rods repel each other, (2) the quartz rods repel the glass rods, and (3) the quartz rods repel each other. After sliding down a plastic slide at the park, your hair stands on end. It continues standing on end even after you get off the slide. What does this imply? Select One of the Following: (a) It implies that you have picked up a net charge from the slide. (b) It implies that your hair has become polarized. (c) It implies that your hair is covered in water and has become a better conductor. (d) It implies that your hair has become conducting. (e) It implies that your hair has become insulating. When an object is grounded, its net charge is reduced to approximately zero. Is this consistent with the Law of Conservation of Charge, if so how? Select One of the Following: (a) It is not consistent with conservation of charge: charge is actually destroyed when an object is grounded. Conservation of Charge only applies in some cases. (b) It is consistent with Conservation of Charge: charge is actually destroyed on the object, but an equivalent charge will be created somewhere else in the universe. (c) It is consistent with Conservation of Charge: charge is not destroyed but is transferred to another object.

Explanation / Answer

Ans 1.11

a) When glass rod is rubbed with felt then there will be transfer of Electron from glass to felt, so glass rod will be positively charged. As two rods of same material so both will have same type of charge and they repel each other.

b) When glass rod and quartz both are rubbed with felt then glass rod will be positively charged and quartz will be negatively charged. Both glass rod will have positive charge so they repel each other and both quartz will have negative charge so both repel each other. But glass and quartz both are oppositely charged so both attract each other. Here two different types of charge.

c) this is also similar case as in part b but glass & quartz will attract each other.

So option b is correct.

Ans 1.12

After sliding down on plastic slide we acquire net electric charge. As transfer of electron took place from man to plastic will be negatively charged. And man will be positively charged. As two unlike charges attract each other. So hair will get straight.

Option a) is correct.

Ans1.13

Law of conservation follows here too. A ground is reservoir of Electron so it can either take or can give electrons to an object in order to neutralize the object. Here also transfer of Electron will take place similar to rubbing two bodies. Conservation of charge follows.

So option (c) is correct.

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