Coulomb\'s force law between the electrically charged objects was experimentally
ID: 1775880 • Letter: C
Question
Coulomb's force law between the electrically charged objects was experimentally discovered by Charles A. de Coulomb. The instrument that Coulomb used in his experiment was:
An ampemeter.
A voltmeter.
A torsion balance.
None of the above
How we may charge a metallic ball by Induction?
We approach the ball with an electrically charged object (without touching it), then touch the ball with a finger, and finally putting the object away.
We heat the ball to a high enough temperature.
We move the ball back an forth in a magnetic field.
None of the above.
You have a rod of plastic and you want to provide the rod with an Electric Charge. What actions you must take?
Rub the rod with a piece of fur. Electrons are transmitted to the rod and it acquires a negative charge.
Rub the rod with a piece of silk. Electrons are transmitted to the rod and it acquires a negative charge.
Rub the rod with a piece of fur. Electrons are transmitted to the fur and the rod acquires a positive charge.
It is impossible to charge the rod.
How can we determine that two objects are charged with charges of different sign?
Finding that the electric force between them is attactive.
Finding that the electric force between them is repulsive.
Finding that there is not any electric force between them.
None of the above.
Which of the following substances is an insulator?
Rubber
Gold
Salted water
None of the above
An ampemeter.
A voltmeter.
A torsion balance.
None of the above
Explanation / Answer
1) An ampemeter.
2) We approach the ball with an electrically charged object (without touching it), then touch the ball with a finger, and finally putting the object away.
3) Rub the rod with a piece of fur. Electrons are transmitted to the rod and it acquires a negative charge.
4) Finding that the electric force between them is attactive.
5) Rubber