P32_040 - . 75 B max /B max = ( r 2 /R ) 1 , or r 2 = R/ ....

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40. (a) From Sample Problem 32-3 we know that B r for r R and B r 1 for r R .S ot h e maximum value of B occurs at r = R , and there are two possible values of r at which the magnetic ±eld is 75% of B max . W edenotethesetwova luesas r 1 and r 2 ,where r 1 <R and r 2 >R .Th en 0 . 75 B max /B max = r 1 /R ,or r
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Unformatted text preview: . 75 B max /B max = ( r 2 /R ) 1 , or r 2 = R/ . 75 = 1 . 3 R . (b) From Eqs. 32-39 and 32-41, B max = i d 2 R = i 2 R = ( 4 10 7 T m / A ) (6 . 0 A) 2 (0 . 040 m) = 3 . 10 5 T ....
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