Figure 29-64 shows a cross section of a long cylindrical conductor of radius a=4.00 cm containing a long cylindrical hole of radius b=1.50 cm. The central axes of the cylinder and hole are parallel and are distance d=2.00 cm apart, current i=5.25 A is uniformly distributed over the tinted area. (a) What is the magnitude of the magnetic field at the centre of the hole ? (b) Discuss the two special cases b=0 and d=0.

Figure 29-64 shows a cross section of a long cylindrical conductor of

1.	Figure 29-64 shows a cross section of a long cylindrical conductor of radius a=4.00 cm containing a long cylindrical hole of radius b=1.50 cm. The central axes of the cylinder and hole are parallel and are distance d=2.00 cm apart, current i=5.25 A is uniformly distributed over the tinted area. (a) What is the magnitude of the magnetic field at the centre of the hole ? (b) Discuss the two special cases b=0 and d=0.
Answer» Answer :(a) `15.3muT;(b)if b=0,THENB=(mu_(0)id)/(2pia^(2))` Now for d=0, the formula GIVES B=0

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