       Re: What's wrong?

• To: mathgroup at smc.vnet.net
• Subject: [mg75334] Re: What's wrong?
• From: siewsk at bp.com
• Date: Wed, 25 Apr 2007 05:41:28 -0400 (EDT)
• References: <f0kbuc\$r25\$1@smc.vnet.net>

```On the wikipedia page for Cross Product, it says

Magnitude[ A cross B ] = Magnitude[A] * Magnitude[B] * Sin[theta]

In spherical coordinates, the vector  {0,1,0} has the magnitude of
ZERO.

Thus   Magnitude[ A cross {0,1,0} ] = Magnitude[A] * ZERO * Sin[theta]
= ZERO

So when the resultant vector has a magnitude of ZERO, it's spherical
coordinates is {0,0,0}

Steven Siew

On Apr 24, 5:34 pm, "gogoan... at yahoo.com.hk" <gogoan... at yahoo.com.hk>
wrote:
> In:=
> <<Calculus`VectorAnalysis`
>
> In:=
> CrossProduct[{1,0,0},{0,1,0},Spherical]
>
> Out=
> {0,0,0}
>
> Isn't the result supposed to be {0,0,1}, even in spherical
> coordinates?
>
> lion

```

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