1. by what factor will the electrostatic force between two charged objects change when the amount of charge on one object doubles?
a. 2
b. 4
c. 1/2
d. 1/4
2. by what factor will the electrostatic force between two charged objects change when the distance between the two charged objects doubles?
a. 2
b. 4
c. 1/2
d. 1/4
3. by what factor will the electrostatic force between two charged objects change when the amount of charge on both objects doubles and the distance between the two charged objects triples?
a. 2/3
b. 3/4
c. 2/9
d. 2/9

1) A. 2

The electrostatic force between two objects is given by:

where

k is the Coulomb's constant

q1 and q2 are the charges of the two objects

r is the separation between the two objects

In this problem, the charge of one object is doubled, so

Therefore the new force is

So, the force will double.

2) D. 1/4

Using the same formula, the electrostatic force between the two objects is:

In this problem, the distance between the two objects is doubled, so

Therefore the new force is

So, the force will decrease to 1/4 of its original value.

3) 4/9

Using the same formula, the electrostatic force between the two objects is:

In this problem, the amount of charge on both objects doubles, so

Also, the distance is tripled

Therefore the new force is

So, the force will decrease to 4/9 of its original value.

the device is called “ rocket engine”

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.