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Suatu kawat berarus listrik dilengkungkan seperti ...

Suatu kawat berarus listrik dilengkungkan seperti gambar. Jika jari-jari lengkungan a = 30 cm, maka besarnya induksi magnetik di pusat lingkaran adalah .... begin mathsize 12px style left parenthesis straight mu subscript 0 space equals space 4 straight pi space straight x space 10 to the power of negative 7 end exponent space Wb. straight m to the power of negative 1 end exponent straight A to the power of negative 1 end exponent right parenthesis end style

  1. 0 comma 83 straight pi space straight x space 10 to the power of negative 7 end exponent space straight T

  2. 2 comma 50 straight pi space straight x space 10 to the power of negative 7 end exponent space straight T

  3. 3 comma 30 straight pi space straight x space 10 to the power of negative 7 end exponent space straight T

  4. 3 comma 30 straight pi space straight x space 10 to the power of negative 5 end exponent space straight T

  5. 2 comma 50 straight pi space straight x space 10 to the power of negative 5 end exponent space straight T

Jawaban:

straight I space equals space 0 comma 5 space straight A  straight a space equals space 30 space cm space equals space 0 comma 3 space straight m

Maka besarnya induksi magnetik di titik P adalah :

straight B space equals space fraction numerator left parenthesis 360 minus 90 right parenthesis to the power of straight o over denominator left parenthesis 360 to the power of 0 right parenthesis end fraction straight x fraction numerator straight mu subscript 0. straight I over denominator 2 space straight a end fraction  straight B space equals space 3 over 4 straight x fraction numerator left parenthesis 4 straight pi space straight x space 10 to the power of negative 7 end exponent right parenthesis left parenthesis begin display style 1 half end style right parenthesis over denominator left parenthesis 2 right parenthesis left parenthesis 0 comma 3 right parenthesis end fraction  straight B equals 1 over 24 straight x fraction numerator 6 straight pi space straight x space 10 to the power of negative 7 end exponent over denominator 10 to the power of negative 1 end exponent end fraction  straight B space equals space 0 comma 25 straight pi space straight x space 10 to the power of negative 6 end exponent space straight T  straight B space equals space 2 comma 50 straight pi space straight x space 10 to the power of negative 7 end exponent space straight T

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