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A hollow cable of inner radius a and outer radius b carries a constant steady current I that is uniformly
distributed over the cross section of the cable. The current is directed out of the page as shown. What
is the magnitude of the magnetic field as a function of the distance r from the center of the cable in the
region between a and b?
b
a
O A. HoI a? – p?
2nr b2 – a?
O B. HoI b² – p2
2rr b2
a?
O C. HoI r2 – a²
2rr b2
a?
O D. HoI r2 – 6²
2Tr b2 – a?
-
Transcribed Image Text:A hollow cable of inner radius a and outer radius b carries a constant steady current I that is uniformly distributed over the cross section of the cable. The current is directed out of the page as shown. What is the magnitude of the magnetic field as a function of the distance r from the center of the cable in the region between a and b? b a O A. HoI a? – p? 2nr b2 – a? O B. HoI b² – p2 2rr b2 a? O C. HoI r2 – a² 2rr b2 a? O D. HoI r2 – 6² 2Tr b2 – a? -
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