[单选题]
The flux through a coil hu5i* q( iug ob uj80ad2n9jg+changes fq1l g(rsll1 n7z7 7xlcls-i 4srom $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?
A. $5.0 \times 10^{-4} \; V$
B. $4.0 \times 10^{-4} \; V$
C. $1.0 \times 10^{-4} \; V$
D. none of the given answers
