$A$ coil having effective area '$A$' is held with its plane normal to a magnetic field of induction '$B$'. The magnetic induction is quickly reduced to $25\%$ of its initial value in $1 \text{ s}$. The e.m.f. induced in the coil (in volt) will be
- A$\frac{BA}{4}$
- B$\frac{BA}{2}$
- C$\frac{3 BA}{8}$
- D$\frac{3 BA}{4}$
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