## Principles of Electricity and Electromagnetism |

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Page 59

By taking the appropriate partial derivatives the vector

Therefore Eq . ( 2 . 13 ) may be written alternatively v = van die

The equipotentials which are evidently of the form ( 1 / r2 ) cos 0 = const . and the

...

By taking the appropriate partial derivatives the vector

**grad**( 1 / r ) is seen to beTherefore Eq . ( 2 . 13 ) may be written alternatively v = van die

**grad**( 2 . 13 ' )The equipotentials which are evidently of the form ( 1 / r2 ) cos 0 = const . and the

...

Page 62

derivatives of U with respect to the coordinates or the components of the vector –

from behind the symbol for the partial derivatives since it does not depend on ...

derivatives of U with respect to the coordinates or the components of the vector –

**grad**U . Therefore F =**grad**( p · E ) = ( p •**grad**) E * ( 2 . 16 ) where p is removedfrom behind the symbol for the partial derivatives since it does not depend on ...

Page 175

in = - e ( D , – D2 )

is = en ( ur + us ) E – Yus + ua )

term in the bracket is the nonelectrical force per unit charge which is brought into

...

in = - e ( D , – D2 )

**grad**n + En ( ui + uz ) Or , since (**grad**n ) / n =**grad**( loge n ) ,is = en ( ur + us ) E – Yus + ua )

**grad**ve - ( D . - Du )**grad**( log . n ) The secondterm in the bracket is the nonelectrical force per unit charge which is brought into

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