For a toroid,$N = 500$,radius $R = 40 \text{ cm}$,and area of cross-section $A = 10 \text{ cm}^2$. Find the inductance in $\mu\text{H}$.

  • A
    $125$
  • B
    $250$
  • C
    $0.00248$
  • D
    zero

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