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The centres of the turns of a toroid form a circle with a radius of 14.0 cm. The cross-sectional area of each turn is 3.00 $c m^{2}$ . It is wound with 5278 turns of fine wire, and the wire carries a current of 4.00 A. The core is filled with a paramagnetic material of magnetic susceptibility $2.90 \times 10^{- 4}$ . What would the magnitude of the magnetic field within the substance?

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12.6 mT

16.6 mT

30.16 mT

10.6 mT

answer is B.

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Detailed Solution

$D = \frac{μ_{0} N I}{2 π R}$

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