# physics

posted by .

Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change?
a. 9
b. 3
c. 1/3
d. 1/9

D

Two positive charges, each of magnitude q, are on the y-axis at points y = +a and y = -a. Where would a third positive charge of the same magnitude be located for the net force on the third charge to be zero?
a. at the origin
b. at y = 2a
c. at y = -2a
d. at y = -a

A

Which is the MOST correct statement regarding the drawing of electric field lines?
a. electric field lines always connect from one charge to another
b. electric field lines always form closed loops
c. electric field lines can start on a charge of either polarity
d. electric field lines can never cross each other

D

• physics -

correct

## Similar Questions

1. ### physics

please check these for me: If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
2. ### NORCROSS

Two positive point charges are held in place, 0.80 m apart. They are then moved so that their electric potential energy doubles. What is the new separation between the charges?
3. ### physics

two pint charges are 4 cm apart. They are moved to a new distance of 2 cm. By what factor does the resulting mutual forces between them change. a. 1/2 b. 2 c. 1/4 d. 4
4. ### physics

Two charges are separated until they are a distance of 191 cm apart, causing the electric force between them to increase by a factor of exactly 5. What was their initial separation distance?
5. ### physics

two charges originally separated by 10cm are moved further apart untill the force between them has decreased by a factor of 10. How far apart are these charges?
6. ### Physics

Two particles with charges +8e and -8e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 7.07 x 10-12 m apart. What is EPEfinal - EPEinitial, which is the change in the …
7. ### Physics

Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them?
8. ### Physics

Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them?
9. ### Physics

Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces?
10. ### Help with physics!

Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces?

More Similar Questions