1. The problem statement, all variables and given/known data My book said that when an aluminium sheet of thickness 0.5 mm is placed on a induction cooker, it will float and be heat up. 2. Relevant equations 3. The attempt at a solution I don't think there is a net repulsive force from the eddy current. When the B field from the induction cooker decrease in magnitude, the eddy current tends to produce a B field in the same direction as the decreasing B field in order to resist change. Therefore, the B field from the eddy current and the induction cooker are in the same direction and attract each other. So half of the cycle is attractive and half is repulsive. Why am I wrong?