Vector identity

  • #1

Homework Statement



I am to show: closed integral {phi (grad phi)} X (n^)dS=0

Homework Equations





The Attempt at a Solution



I understand I am to use divergence theorem here.but cannot approach.Please help
 

Answers and Replies

  • #2
Dick
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Is 'X' supposed to mean a cross product between the normal vector and the gradient?
 
  • #3
yes.It means that.
 
  • #4
Dick
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Try using [tex]\int_S n \times a dS = \int_V curl(a) dV[/tex].
 
Last edited:

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