The answer says it's 0 but I don't understand which direction is the magnetic field.
Use the Equations:
1) Magnetic Flux= Area of Loops x B x ( Magnetic Field).
2) Magnetic Flux= Area Loops x B x cos$\displaystyle (\theta)$
Since the magnetic field is perpendicular to the plane of loops, no a, so use equation 1 *Dont forget to convert $\displaystyle cm^2 to m^2$
$\displaystyle (\frac{8 * 10}{10,000}) (5 X 10^-2)$
MF = 0.0004 volts/sec