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Need help understanding these equations...

 
 
Swapnil
 
Reply Fri 17 Apr, 2015 12:43 am
In my physics textbook I came across a derivation in which the calculations seemed a bit inaccurate.
E = 2[q/{4(pi)E. (r^2 + a^2)}] cos(x)
Here cos(x)=a/r
E= 2qa/[4(pi)E. {(a^2 + r^2)^(3/2)}]
^^ I don't understand how it became this
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Lordyaswas
 
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Reply Fri 17 Apr, 2015 12:54 am
@Swapnil,
Neither do I.
Swapnil
 
  1  
Reply Fri 17 Apr, 2015 01:12 am
@Lordyaswas,
I'm sorry I've made a mistake.
Here cos(x)= a/(a^2 + r^2)
But even with this new value, the result seems inaccurate.
Swapnil
 
  2  
Reply Fri 17 Apr, 2015 01:20 am
@Swapnil,
Oh no no no I'm sorry.
Cos(x) = a/[(a^2 + r^2)^(1/2)]
Now it makes sense.
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