The space inside a toroid is filled with tungsten whose susceptibil...

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The space inside a toroid is filled with tungsten whose susceptibility is \( 6.8 \times 10^{-5} \). The percentage increase in the magnetic field will be
(a) \( 0.0068 \% \)
(b) \( 0.068 \% \)
(c) \( 0.68 \% \)
(d) None of these
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