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Яка з формул визначає магнітну індукцію поля, створеного у вакуумі струмом І ,...

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Яка з формул

визначає магнітну індукцію поля, створеного у вакуумі струмом

І

, що тече

по провіднику скінченної довжини і довільної форми?

А) d B with rightwards arrow on top equals fraction numerator mu subscript 0 divided by over denominator 4 straight pi end fraction times integral subscript l fraction numerator open square brackets r with rightwards arrow on top comma d l close square brackets over denominator r cubed end fraction   Б) d B with rightwards arrow on top equals fraction numerator mu divided by over denominator 4 straight pi end fraction times integral subscript l fraction numerator open square brackets r with rightwards arrow on top comma d l with rightwards arrow on top close square brackets over denominator r squared end fraction  В) d B with rightwards arrow on top equals fraction numerator mu subscript 0 divided by over denominator 4 straight pi end fraction times integral subscript l fraction numerator open square brackets d l with rightwards arrow on top comma r with rightwards arrow on top close square brackets over denominator r cubed end fraction

Г)  d B with rightwards arrow on top equals fraction numerator mu divided by over denominator 4 straight pi end fraction times integral subscript l fraction numerator open square brackets r with rightwards arrow on top comma d l with rightwards arrow on top close square brackets over denominator r cubed end fraction  Д) d B with rightwards arrow on top equals space fraction numerator mu divided by over denominator 4 straight pi end fraction times integral subscript l fraction numerator open square brackets r with rightwards arrow on top comma d l with rightwards arrow on top close square brackets over denominator r squared end fraction

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