Two coils $A$ and $B$ have a coefficient of mutual inductance $M = 2 \ H$. The magnetic flux passing through coil $A$ changes by $4 \ Wb$ in $10 \ s$ due to the change in current in coil $B$. Then:
- Athe change in current in $B$ in this time interval is $0.5 \ A$.
- Bthe change in current in $B$ in this time interval is $2 \ A$.
- Cthe change in current in $B$ in this time interval is $8 \ A$.
- Da change in current of $1 \ A$ in coil $A$ will produce a change in flux passing through $B$ by $4 \ Wb$.
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