# Physics

posted by .

1)Which of the following statements is true about electric forces?

A)electric forces cause objects to only attract each other.
B)electric forces cause objects to only repel each other
C)electric forces cause objects to repel or attract each other
D)electric forces have no effect on each other

2)A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden door. What is the nature of the charge on the wooden door?

A)electrically neutral
B)positively charged
C)conductor
D)lacking protons

I got 3 different answers each time for A-C, but my final answer is A.

• Physics -

1 A)

2. The overall charge of the door may be neutral if it is not electrically grounded, but the door area in contact with the balloon is charged positively in any case, due to polarization and induction. I don't whether to advise you to answer A or B, because the question is too vague about grounding and which part of the door they are referring to.

• Physics -

1) elctric forces do both that's why like charges repel and opposites attract

• Physics -

Yes, I meant to write C. for (1) I was concentrating on answering your second question. My mistake.

## Similar Questions

1. ### Physics

Which of the following statements is true about electric forces?
2. ### Physics - electrons/protons

If you place a free electron and a free proton in the same electric field, how do the forces acting on them compare?
3. ### Physics

There is an electric field at a certain point P, where initially there is no charge. A point-like object is placed at point P, and a force on the object is observed. Next the object is removed and another point-like object is placed …

Do charged particles always experience equal but opposite electrical forces?
5. ### IPC

i don't have a book or anything to go look all this stuff up so i really need help understanding this.. Which of the following statements is not true?
6. ### science

what are the forces on two charges of +0.44c and +2.4c, if they are separated bu=y a distance of 3.16cm?