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The gradient points in the direction of steepest ascent
The vanishing of the divergence applies to all charge-free points in any central inverse-square vector field, and to any linear combinations of such fields.
Now, if we let n→=(a,b,c), n → = ( a , b , c ) , then since P0P−→− P 0 P → is perpendicular to n→, n → , we have
Vector addition for vectors at any angle | Adding vectors | How to add vectors