I know that two infinitely long straight conductors will attract each other when kept parallel if current flows in the same direction in both. If two circular loops are placed such that their planes are parallel, current in the same direction, will they attract? Also, does a loop carrying current experience any force if placed in a uniform magnetic field. F = I (l X B) l is a vector, so I believe l=0 for a loop since the initial and terminal points are the same. Is that correct?