A square loop of side 1m and resistance 1Ω is placed in a magnetic...

As plane of loop is perpendicular to the direction of magnetic field, therefore direction of area vector will be parallel to magnetic field.

Magnetic flux is given by,

$ϕ = \overset{\to}{B} \cdot \overset{\to}{A} = 0 . 5{\left(1\right)}^{2}\cos 0 ° = 0 . 5Wb$