Unformatted text preview: N , and we just deFne the magnitude to beτ . In other words, we see that d ds B =τ N . Now we approach the derivative of N . We can write N = B × T , just by thinking about the right hand rule. Now we di±erentiate this, using the previous rules: d N ds = p d B ds P × T + B × p d T ds P =τ N × T + B × κ N . Now we just rewrite the cross products using the right hand rule:τ N × T + B × κ N = τ Bκ T . 1...
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 Spring '09
 Stojanovic
 Vectors, Formulas, Dot Product, Righthand rule, DS DS DS

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