# There are two coils A and B separated by some distance. If a current of 2A flows through A, a magnetic flex of $10^{-2}$ wb passes through B (no current through B). If no current passes through A and a current of 1A passes through B, what is the flex through A?
(a) $5 \times 10^{-3} wb$
(b) $5 \times 10^{3} wb$
(c) $5 \times 10^{-2} wb$
(d) $5 \times 10^{2} wb$