How will you describe the magnetic field around a current-carrying coil?
a. the magnetic field is weakest near and around the coilb)the magnetic field vary directly with the distance from the coilc)the magnetic field is strongest inside the current-carrying coild)the magnetic field lines are closed loops along the loops in the coil

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?