P30_019 - 2 x = idx 2 xw . Thus, B P = Z d B P = i 2 w Z d...

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19. Consider a section of the ribbon of thickness dx located a distance x away from point P . The current it carries is di = idx/w , and its contribution to B P is dB P = µ 0 di
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Unformatted text preview: 2 x = idx 2 xw . Thus, B P = Z d B P = i 2 w Z d + w d dx x = i 2 w ln 1 + w d , and ~ B P points upward....
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