- #1

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Which method would you recommend me in order to easily deduce the direction?

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- Thread starter greg_rack
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- #1

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Which method would you recommend me in order to easily deduce the direction?

- #2

Mentor

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Can you write which formula you are having trouble with?

- #3

Science Advisor

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.. it's involving a vector product.

Which method would you recommend me in order to easily deduce the direction?

From: https://en.wikipedia.org/wiki/Cross_product#Definition

But note that for negative charges the direction flips, so you can use the left hand.

- #4

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That's what I meant, thank you very much!

From: https://en.wikipedia.org/wiki/Cross_product#Definition

But note that for negative charges the direction flips, so you can use the left hand.

- #5

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Alternatively, imagine the usual ##x-y## axes, with the x-axis pointing left to right across the page and the y-axis pointing up the page, then the z-axis is upwards from the page. And ##\vec x \times \vec y = \vec z##.That's what I meant, thank you very much!

Last edited:

- #6

Science Advisor

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Note that you can cycle the fingers used. I personally find this easier to remember:That's what I meant, thank you very much!

because it is the finger order I use in counting.

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