anonymous
  • anonymous
the electric field strength 5cm from a very long charged wire is 2000N/C. what is the electric field strength 10cm from the wire?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Shayaan_Mustafa
  • Shayaan_Mustafa
Use equation, E=F/q
anonymous
  • anonymous
what i have is \[E=1/(4\pi \epsilon _{0}) * Q/r^{2}\]
Shayaan_Mustafa
  • Shayaan_Mustafa
but you don't have charge. so you can't use this relation.

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More answers

anonymous
  • anonymous
\[Q=L \lambda\] and the prof said use 2 for L. not sure why, maybe 10cm/5cm but why do that?
anonymous
  • anonymous
after i solve for 5cm, i use the value i got for charge density to plug in for 10cm and got 500 N/C. i don't understand why L=2 and if i still use L=2 to solve for 10cm
Shayaan_Mustafa
  • Shayaan_Mustafa
there are two equations, 1) E=kq/r² find charge from above equation and put it in, 2) E=F/q find Force from above relation
Shayaan_Mustafa
  • Shayaan_Mustafa
did you got?
Shayaan_Mustafa
  • Shayaan_Mustafa
why L=2?? may be due to doubling the length.
anonymous
  • anonymous
not really, i can't recall how to solve for force. force of field on wire or vice versa?
anonymous
  • anonymous
or are you saying solve for force after i find E?
Shayaan_Mustafa
  • Shayaan_Mustafa
ok follow me.
anonymous
  • anonymous
alright
Shayaan_Mustafa
  • Shayaan_Mustafa
use 1 equation and find Q by substituting values, k=9*10^9 E=2000 r=0.05m
anonymous
  • anonymous
right
anonymous
  • anonymous
Q=5.56*10^-10
Shayaan_Mustafa
  • Shayaan_Mustafa
ok good. Now use equation 2 and find F. by substituting values of, E=2000 q=5.56*10^-10
anonymous
  • anonymous
should be 1.11*10^-6
anonymous
  • anonymous
i will try to work more on it you will get a notification if i add more to this later, gotta go, thank you
Shayaan_Mustafa
  • Shayaan_Mustafa
you are welcome.
JamesJ
  • JamesJ
The electric field about a long, straight charged wire is given by \[ E(r) = \frac{\lambda}{2\pi \epsilon_0 r} \] where \( \lambda \) is the charge density. (See for example here: http://farside.ph.utexas.edu/teaching/302l/lectures/node26.html ) Given that, and what you are told about \( E(r) \) for \( r = 0.05 m \), you can then find \( E(r) \) for \( r = 0.10 m \).
Shayaan_Mustafa
  • Shayaan_Mustafa
hey jamesj who is this person who is reviewing 3rd question of emcrazy14?
anonymous
  • anonymous
i am still confused. i solved for the charge density given 2000N/C for 5cm but i used 2 for L. L isn't given so i really don't understand why 2. well, it's the same wire the question is asking about so i used it and my answer is 500N/C which seems reasonable...
JamesJ
  • JamesJ
From the formula I wrote above for the electric field, you see that it scales as 1/r. So at twice the distance away it should be 1/2, not 1/4
anonymous
  • anonymous
thx, i had my r squared, should be able to get it now

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