Register to reply 
Two particles having charges separated by a distance 
Share this thread: 
#1
Apr2208, 10:50 PM

P: 35

Two particles having charges of 0.600 nC and 5.40 nC are separated by a distance of 1.30 m.
A.) At what point along the line connecting the two charges is the net electric field due to the two charges equal to zero? the electric field is zero at a point _______ m from .600nC i found out the answer to this to be .325m. by doing the following: E due to q1 is equal in magnitude to E due to q2 but in opposite direction As both q1 and q2 are positive, the field is zero at a point in between them As distance from q1 is L , distance from q2 is (1.3  L) kq1/L^2 = kq2/(1.2  L)^2 (1.3  L) / L= sq rt (q2 / q1) (1.3  L) = L* sq rt (q2 / q1) 1.3 = L [1+sq rt (q2 / q1)] L = 1.3 / [1+sq rt (q2 / q1)] L = 1.3 / [1+sq rt (5.40 / 0.600)] L = 1.3 / [1+sq rt ( 9.00 )] L = 1.3 / [1+ 3.0] L = 1.3 / [ 4.0] L=0.325 meter from 0.550 nC Where would the net electric field be zero if one of the charges were negative. Enter answer as a distance from the charge initially equal 0.600 nC . This is where i get lost, i don't know what to do next. please Help! __________________ 


#2
Apr2208, 11:11 PM

P: 87

You do it like you did the first one. Start with
[tex]\vec{E_1} + \vec{E_2} = 0[/tex] Be careful about the vector directions. 


#3
Apr2308, 09:41 AM

P: 35

should the answer be the same but just negative since i using the same values as before?



#4
Apr2308, 10:14 AM

P: 87

Two particles having charges separated by a distance
When I wrote, "You do it like you did the first one," I meant, you start it the same way. The algebra is different.
I apologize; I should have been clearer. 


#5
Apr2408, 04:31 PM

P: 35

Thanks A Bunch!



#6
Apr2408, 04:52 PM

P: 87

You're welcome.



Register to reply 
Related Discussions  
Finding charges using electric field and distance  Introductory Physics Homework  10  
Distance between two charges where field strength = 0  Introductory Physics Homework  9  
Finding the distance of 2 charges  Introductory Physics Homework  0  
Distance between charges.  Introductory Physics Homework  3  
Distance between charges  Introductory Physics Homework  1 