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- Thread starter Fatima Hasan
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- #2

BvU

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The directions matter (to some extent), but

do the signs matter ? They are only asking for a magnitude ...

- #3

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YeahKnow about the right-hand rule ?

- #4

BvU

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So draw the arrows to find how you have to add them.Yeah

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BSo draw the arrows to find how you have to add them.

B

So , B

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BvU

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I'd vote for ##-\hat k##the direction of I2 is (-i)

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- #8

BvU

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I hope you now understand my frivolous 'do the signs matter': in this case just knowing that the field vectors are perpendicular is enough to get 10 ##\mu##T as answer. Normally the signs certainly do matter.

To boot a small ##\TeX## tip: Donald Knuth has provided \imath and \jmath so the hat and the dot don't pile up: ##\ \hat\imath,\ \hat\jmath ##

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