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Unformatted text preview: 28-44 A toroidal solenoid has inner radius 13.5 cm and outer radius 17.7 cm. The solenoid has N turns and carries a current of I . What is the magnitude of the magnetic field at distances r from the center of the torus such that (A) r is inside the torus, (B) r is in the center of the coils, and (C) r is greater than the outside radius of the torus? 28-47 A toroidal solenoid with 500 turns is wound on a ring with a mean radius of R . Find the current in the winding that is required to set up a magnetic field of magnitude B in the ring if the ring is made of (A) annealed iron ( K _m=1400) or (B) silicon steel ( K _m=5200). (A) (B) outside the wire: The maximum field is at the surface of the wire, r=R . For larger R , the field falls off as 1/R (Ampere's Law will show that the field is the same as that of a thin wire) , so the point where the field is half as large is at r =2 R ....
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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .
- Spring '08