Statics and CIrcuits

Which of the following are true of static charges? Choose all that apply.

• Like charges repel.

• Like charges attract.

• Opposite charges repel

• Opposite charges attract.

• A negatively charged object has gained electrons.

Identify only the following objects that are positive

• A formerly neutral object that just gained some electrons.

• A formerly neutral object that just lost some electrons

• An object which attracts a negatively-charged balloon and attracts a positivelycharged balloon.

• An object possesses more protons than electrons.

Identify the following objects that are negative

• A formerly neutral object that just gained some electrons

• An object which attracts neutral attracts paper bits and repels a negatively-charged balloon.

• A formerly neutral object that just lost some electrons.

• An object which attracts a negatively-charged balloon

Identify the following objects that could be neutral

• An object which attracts a negatively-charged balloon

• An object which attracts a charged balloon (balloon A) which is attracted to a negatively-charged balloon

• An object which attracts neutral attracts paper bits and repels a negatively-charged balloon.

• An object which attracts a balloon (balloon C) which is repelled by a   negatively-charged balloon

A positively-charged glass rod is touched to the plate of a neutral electroscope. Upon contact, the electroscope becomes charged and the needle deflects. Which of the following statements are true of the charged electroscope

• The electroscope is now charged positively

• The electroscope gained protons during the charging process

• During the charging process, some electrons left the electroscope and entered the glass rod

• The electroscope and the glass rod now have the same type of charge

A neutral plastic strip is rubbed with cotton and acquires a positive charge. Which of the following statements are true of the positively-charged strip?

• It lost all of its electrons to the cotton during the charging process.

• It lost some electrons to the cotton during the charging process

• It gained protons during the rubbing process.

• It has an excess of protons compared to the number of electrons

• It could exert either a repulsive or attractive influence upon neutral paper bits.

A positively-charged glass rod is touched to the plate of a neutral electroscope. Upon contact, the electroscope becomes charged and the needle deflects. Which of the following statements are true of the charged electroscope?

• The electroscope was charged by the method of induction.

• The number of electrons present in the electroscope is less than the number of   protons.

• The electroscope needle will deflect even more if the glass rod is brought near it again.

• The electroscope needle would slowly approach the neutral position if a negatively-charged balloon is brought near.

Charge carriers in a metal are electrons rather than protons. This is due to the fact that electrons are

• loosely bound

•  lighter

• far from a nucleus

• all of the above

Two like charges ________.

• attract each other

• repel each other

• neutralize each other

• have no effect on each other

• must be neutrons

If you comb your hair and the comb becomes positively charged, then your hair becomes _______.

• positively charged

• negatively charged

• uncharged