Saturday

October 25, 2014

October 25, 2014

Posted by **Angela** on Friday, February 25, 2011 at 2:08pm.

I have a few review questions that I don't know how to do. Below they are numbered and in parenthesis I answered what I think you might have to do to get the answer. Please help me in any way you can. Your help is much appreciated! =)

1. What is the value of a charge of a body that carries 20 excess electrons?

(For number 1, I think that the question asks you to pretend that something is negatively charged by 20 electrons. So I think you take the charge of an electron, which is 1.6 x 10^-19, and multiply it by 20. If you do that, the answer is 3.2 x 10^-18.)

2. Two like charged balloons, placed at a distance of .5 meters, experience a repulsive force of .32 N. What is the force if the distance between the two balloons is doubled?

(For number 2, if you use Coulomb's Law, the equation used to find .32 N was Force = the constant of K multiplied by the product of the charges divided by the square of the distance. Therefore, I think to solve this, you need to double r, which would mean that force is one-fourth of what it originally was. Following that, I think you divide .32 N by 4 and the answer would be .08 N.)

3. What is the force between two small charged spheres that have charges of 2 x 10^-7 and 3 x 10^-7 if the distance of r is 30 cm.

(For number 3, I think you use Force = the constant of K multiplied by the product of the charges divided by the square of the distance again. If you plug in the numbers, you would get 6 x 10^-7. I am almost sure this is right, if you could please plug in the numbers and let me know if this is the answer because for some reason I can never get the right numbers even if I follow the right steps.)

THANK YOU SO MUCH!

- Static Electricity. 11th Grade Pre-AP Physics -
**Angela**, Friday, February 25, 2011 at 2:12pmHi everyone. I also broke these up into separate questions because I figured it would be easier to answer that way in case your specialty is one of the questions and not static electricity as a whole.

Thanks to everyone who helps!

- Static Electricity. 11th Grade Pre-AP Physics -
**bobpursley**, Friday, February 25, 2011 at 2:34pmall correct., except I wont do the calculations for you.

**Answer this Question**

**Related Questions**

Science - I need help with static electricity and generating current electricity...

comma splice - Dr. frankenstein flung a power switch, ble streamers of static ...

science - i need to know if there are any technologies that were developed from ...

Science - Hello I have an exam coming and my question is : Why do we sometimes ...

Electronic Basics - Two electronics students are discussing static electricity ...

Scince - What is static electricity?

science - What is static electricity?

Physics - How many excess electrons does an object with a total charge of -1.0 x...

English - Yes. That is correct. Comma Splice How do I write this correctly? Dr. ...

Science - What are the similarities and differences of static and current ...