# Explain why there is no induced current in a closed loop of wire when the area of the loop is perpendicular to the magnetic field.

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Induced current is caused by the magnetic flux going through the loop.

The flux is determined by the area exposed to the magnetic field and is proportional to the cosine of the angle between the the area of the loop and the direction of the magnetic field lines.

When the area of the loop is perpendicular to the field lines the cosine of the angle is zero, thus no induced current.