Percentage increase in the field of a toroid when its core is filled with a material of susceptibility chi

1. A.
   $\frac{\chi}{2} \times 100$
2. B.
   $2\chi \times 100$
3. C.
   $(1 + \chi) \times 100$
4. D.
   $\ \chi \times 100$

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1. A.
   $2.6 \times 10^{-5}$
2. B.
   $2.6 \times 10^{-4}$
3. C.
   $2.6 \times 10^{-3}$
4. D.
   $2.6 \times 10^{2}$

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