Two coils $\mathrm{A}$ and $\mathrm{B}$ have a coefficient of mutual inductance $M=\mathrm{2 }\mathrm{H}$. The magnetic flux passing through coil $\mathrm{A}$ changes by $4 \mathrm{Wb}$ in $10 \mathrm{s}$ due to change in current in $\mathrm{B}$. Then

• A

  Change in current in $\mathrm{B}$ in this time interval is $0.5 \mathrm{A}$
• B

  Change in current in $\mathrm{B}$ in this time interval is $8 \mathrm{A}$
• Correct answer
  C

  The change in current in $\mathrm{B}$ in this time interval is $2 \mathrm{A}$
• D

  A change in the current of $1 \mathrm{A}$ in coil $\mathrm{A}$ will produce a change in flux passing through $\mathrm{B}$ by $4 \mathrm{Wb}$

Hence, the correct answer is option: 'C'.