All right i have a simple problem but i just want to verify my results, so any help would be greatly appreciated. The problem is as follows: 7.1* 10^12 electrons are added to a body that already has a negative charge of 0.2uC(the u is micro 10^-6). Calculate the final charge on this body. Now i have (7.1* 10^12)(1.602* 10^-19) + (0.2* 10^-6) which gave me 1.337 uC is this correct?
whoops, i think it should have been: (7.1* 10^12)(- 1.602* 10^-19) + (0.2* 10^-6) which gave me 0.937 uC now im lost...please help.
ok, formula should be: (7.1* 10^12)/(6.24* 10^18) + (0.2*10^-6) = 1.337 uC which is the same as the first result i got...... 0_o i am going to go with this one. is this correct?
Check all of your negative signs. The problem states that the body already has a negative charge, Your magnitude looks right, but the sign is wrong. [mod hat] Moving the thread to homework help. [/mod hat]
Thanks you were right about the sign, it was supposed to be -1.337 uC Also, sorry about the location of my topic i only put it there because the course i am taking is electrical engineering and there was a section that matched exactly. I just joined the forum and i already know i will be here every day to read up on the info i need. Thanks again for the help, i will keep all homework related problems here.