The area of a coil is $A$. The coil is placed in a magnetic field which changes from $B_{0}$ to $4 B_{0}$ in time $t$. The magnitude of the induced e.m.f. in the coil will be:
- A$\frac{3 AB_{0}}{t}$
- B$\frac{4 AB_{0}}{t}$
- C$\frac{3 B_{0}}{At}$
- D$\frac{4 B_{0}}{At}$
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