When the distance between the two charges is doubled, the force between them is

Question

When the distance between the two charges is doubled, the force between them is A) doubled. B) reduced by a factor of 3. C) reduced by a factor of 4. D) quadrupled. A charged particle enters an electric field directed vertically upward. If the charged particle experiences a force downward because of this field, what is the sign of the charge on this particle? A) It is neutral. B) It is negative. C) It is positive. D) None of the other choices is correct. Which of the following statements is correct for a conductor? A) The electric field outside the surface of the conductor is perpendicular to the surface. B) All excess charges go to the surface of the conductor. C) The electric field is zero inside the conductor. D) All of the other answers apply.

Explanation / Answer

Solution:

1 .C)reduced by a factor of 4.

According to Coulomb's law, Force is inversely proportional to the square of the distance between the charges.

So when the distance is doubled, Force reduces by 4.

2. C) It is positive.

Since the electric field is directed upwards, the charged particle is negative .

Vertically directed upwards means the field is from - to +. So the particle is attracted towards the negative.

3) D )All answers apply.

  

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