In a magnetic field of $0.05\,T$,the area of a coil changes from $101\,cm^2$ to $100\,cm^2$ without changing the resistance,which is $2\,\Omega$. The amount of charge that flows during this period is:
- A$2.5 \times 10^{-6}\,C$
- B$2 \times 10^{-6}\,C$
- C$10^{-6}\,C$
- D$8 \times 10^{-6}\,C$
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