Saturday

January 31, 2015

January 31, 2015

Posted by **aichan** on Thursday, October 13, 2011 at 8:15am.

can some one explain to me how to do this step by step. Not that great at math hope you can help. Thanks

- Physics -
**drwls**, Thursday, October 13, 2011 at 9:01amThere is a formula for the force (F) between two charges (Q1 and Q2), separated by a distance R. It is called Coulomb's Law. It must be in your text or notes; otherwise they would not have assigned this problem.

The formula says

F = k Q1*Q2/R^2

where k is a constant that equals 8.99*10^9 N*m^2/C^2

In your case, Q1 = Q2 = q, so

F = k*q^2/R^2

Rearrange the equation algebraically and solve for q

q = R sqrt(F/k)= 3.7*10^-10m*sqrt(2.636*10^-13)M/m

= 1.9*10^-16 Coulombs

- Physics -
**aichan**, Thursday, October 13, 2011 at 10:12amThanks!

- Physics (typo correction) -
**drwls**, Thursday, October 13, 2011 at 10:45amq = R sqrt(F/k)

= 3.7*10^-10m*sqrt(2.636*10^-13)C/m

C stands for Coulombs

I typed M where it should be C

**Answer this Question**

**Related Questions**

Physics - Two point charges are 10.0 cm apart and have charges of 2.0 μC ...

Science - Two point charges are 10.0 cm apart and have charges of 2.0 μC ...

Physics Need Help PLEASE - Two point charges are separated by 8 cm. The ...

physics - Two point charges are separated by 6.4 cm. The attractive force ...

Physics - Hi, I solved this problem, but I want to make sure it is correct: 2 ...

Physics (SO CONFUSED!!!) - I think I'm using the wrong formulas or SOMETHING... ...

Science (Please Respond SOON!) - I think I'm using the wrong formulas or ...

physics - two point charges of 2 c and -3c are separated by 6cm what is the ...

Physics - Two point charges, Q1 = -7.0 and Q2 = 2.0 are located between two ...

Physics - Three point charges have equal magnitudes, two being positive and one...