Vrste električnih naboja – problemi i rješenja
1. Based on the figure of the electric charges u nastavku.
Objects A and D are negatively charged (-), object A privući object B and odbija object C, object D odbija E. Determine type of electric charge of object B, C, and E.
A. Positive, Positive, Negative
B. Negative, Negative, Positive
C. Positive, Negative, Negative
D. Positive, Negative, Positive
rješenje:
The electric charge consists of two types: positive electric charge and negative electric charge. Each type of charge repels the same type but attracts the opposite type. That is: unlike charges attract; like charges repel.
If charge A is a positive charge, charge A repels charge B, then the charge B is a positive charge. If charge P is a negative charge, charge P attract charge Q, then the charge Q is a positive charge.
A is a negative charge.
D is a negative charge.
A attract B so that B is a positive charge.
A repels C so that C is a negative charge.
D repels E so that E is a negative charge.
Types of charges B, C, and E is positive, negative, negative.
Točan odgovor je C.
2.
If the glass is rubbed with a silk, the correct explanation in the following table is …
Riješenje
Glass has a positive charge, so if the glass is rubbed with a silk cloth then the electrons move from the glass to the silk, so the glass has more protons than the electrons.
Protons are positively charged therefore glass becomes positively charged. Instead, silk has more electrons than protons. The electrons are negatively charged so that the silk fabric becomes negatively charged.
Točan odgovor je A.
3. Plastic rod rubbed with wool, the correct explanation is…..
A. E.lectrons in the wool move to plastic, plastic negatively charged
B. Electrons in the plastic move to wool, wool negatively charged
C. Electrons in the wool move to plastic exchanging with protons, wool negatively charged
D. Electrons in the plastic move to wool and exchange with protons, plastics positively charged
rješenje:
The electrical charge on plastics is internationally agreed as a negative charge.
Plastic or any object becomes negatively charged due to excessive electrons. Because the plastic is rubbed with wool it is concluded that electrons move from wool to plastic.
Točan odgovor je A.
4. There is a ball P conductor with negatively charged and four balls of Q, R, S, T.
Ball P attract Q and repels S. Ball Q repels R and ball S repels T. If ball P brought closer to ball R and ball T then…..
Riješenje
P privući Q tako da Q is a positive charge
P odbija S tako da S is a negative charge
Q odbija R tako da R is a positive charge
S odbija T tako da T is a negative charge
If ball P brought close to ball R then they attract each other.
If ball P brought close to ball T then they repel each other.
Točan odgovor je D.
