# physics

posted by .

A charge of 2.1 nC and a charge of 4.7 nC are separated by 57.90 cm. Find the equilibrium position for a -4.7 nC charge.
____ cm from the 2.1 nC charge.

what is the answer? and how did you get it? thaanks

• physics -

The equilibrium position is between the two charges,there tha attractive forces to the +2.1nC and +4.7 nC charges are equal and opposite. If x is the distance from the 2.1 nC charge, require that
2.1/x^2 = 4.7/(57.9-x)^2

Solve that equation for x, which will be in centimeters. The -4.7 nC charge cancels out, as does the Coulomb constant, making the solution easy. You can use nC for charge and cm for distance on both sides of the equation.

(57.9-x)/x = sqrt(4.7/2.1) = 1.496

57.9/x = 2.496
x = ?

## Similar Questions

1. ### physics

a charge of 7.2 nC and a charge of 6.7 nC are separated b 32 cm. Find the equilibrium position for a -3.0 nC charge.
2. ### physics

A charge of 2.4 nC and a charge of 5.0 nC are separated by 33.30 cm. Find the equilibrium position for a -4.1 nC charge.
3. ### physics

A charge of 2.0 nC and a charge of 5.3 nC are separated by 41.80 cm. Find the equilibrium position for a -4.7 nC charge. ___ cm from the 2.0 nC charge.
4. ### physics

A charge of 2.1 nC and a charge of 4.7 nC are separated by 57.90 cm. Find the equilibrium position for a -4.7 nC charge. _______________cm from the 2.1 nC charge. i know you have to use coulomb's law but how can i use it
5. ### physics

A charge of 3.0 nC and a charge of 5.8 nC are separated by 53.40 cm. Find the equilibrium position for a -4.7 nC charge.
6. ### Physics- Coulomb's Law

1) Particles of charge Q1 = +77 µC, Q2 = +44 µC, and Q3 = -80 µC are placed in a line. The center one (Q2) is 0.35 m from each of the others. Calculate the net force on Q1 and Q2 due to the other charges. a) Force on Q1 Magnitude …
7. ### physics

5. A charge of -5.00 nC and a charge of -2.00 nC are separated by a distance of 40.0 cm. Find the equilibrium position (where the net force equals zero) for a third charge of 15.0 nC.
8. ### Physics

A charge q1 of -5.00*10^-9C and a charge q2 of -2.00*10^-9C are separated by a distance of 40.0cm. Find the equilibrium position for a third charge of 15.0*10^-9C
9. ### Physics

A charge q1 of -5.00*10^-9C and a charge q2 of -2.00*10^-9C are separated by a distance of 40.0cm. Find the equilibrium position for a third charge of 15.0*10^-9C
10. ### science

A charge of +9.0 nC and a charge of +4.0 nC are separated by 50.0 cm. Find the equilibrium position for a −1.0 nC charge as a distance from the first charge. The Coulomb charge is 8.98755 × 109 N · m2 /C 2 . Answer in units …

More Similar Questions