The region inside a current-carrying toroid is filled with a material (Niobium) having magnetic susceptibility $\chi = 2.6 \times 10^{-5}$. The percentage increase in the magnetic field in the presence of Niobium over that without it is:

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

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