The magnetic flux through a coil of resistance $R$ changes by an amount $\Delta \phi$ in time $\Delta t$. The total quantity of induced electric charge $Q$ is

  • A
    $\frac{\Delta \phi}{\Delta t}$
  • B
    $-\frac{\Delta \phi}{\Delta t}+R$
  • C
    $\frac{\Delta \phi}{R}$
  • D
    $\frac{\Delta \phi}{\Delta t} \times R$

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