P29_044 - I L ( d ~ L ~ B ) = ( I L d ~ L ) ~ B is not...

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44. The total magnetic force on the loop L is ~ F B = i I L ( d ~ L × ~ B )= i ( I L d ~ L ) × ~ B =0 . We note that H L d ~ L =0. If ~ B is not a constant, however, then the equality
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Unformatted text preview: I L ( d ~ L ~ B ) = ( I L d ~ L ) ~ B is not necessarily valid, so ~ F B is not always zero....
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