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Unformatted text preview: z = 2 m. If the two loops have the same radius a = 3 m, determine the magnetic field at: (a) z =0, (b) z =1 m, (c) z =2 m. (3) Two identical coaxial coils, each of N turns and radius b, are separated by a distance d, as shown in the Figure below. A current I flows in each coil in same direction. (a) Find the magnetic flux density B = a x B x at a point midway between the coils. (b) Show that dB x / dx vanishes at midpoint. (c) Find the relation between b and d such that d 2 B x / dx 2 also vanishes at the midpoint. (Such pair of coils is used to obtain an approximately uniform magnetic field in the midpoint region. They are known as Helmholtz coils.) (4)...
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 Spring '08
 Joshi
 Magnetic Field, TA, 1 m, 3 m, 2 m, 20turn circular loop

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