Which of the following units denotes the dimension $\frac{M L^2}{Q^2}$,where $Q$ denotes the electric charge?

  • A
    $Weber$ $(Wb)$
  • B
    $Wb / m^2$
  • C
    $Henry$ $(H)$
  • D
    $H / m^2$

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Which of the following is not a unit of self-inductance?

$A$ toroid is a long coil of wire ($N$ turns) wound over a circular core. The coefficient of self-induction of the toroid is [The magnetic field in it is uniform and $R >> r$,where $r=$ radius of wire,$R=$ radius of coil] ($\mu_0=$ permeability of free space).

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