A square loop of side a placed in the same plane as a long straight wire carrying a current i. The centre of the loop is at a distance r from the wire, where r>>a. The loop is moved away from the wire with a constant velocity y. The induced emf in the loop is
(Α) μοίαν/2πr
(Β) μοία3ν/2πr3
(C) μοίν/2π
(D) μοία2ν/πr²