Just provide the answers with just a short few words explanation or just provide the equation if relevant:

55. The graph shows the magnitude B of a uniform magnetic field that is perpendicular to the plane of a conducting loop. Rank the four regions indicated on the graph according to the magnitude of the emf induced in the loop, from least to greatest. oW w N = zgozs o= o W o i - 56. A magnet moves inside a coil. Consider the following factors: I. strength of the magnet II. number of turns in the coil III. speed at which the magnet moves Which can affect the emf induced in the coil? A) Tonly B) II only C) II only D) I and II only E) L II, Il 57. A square loop of wire lies in the plane of the page. A decreasing magnetic field is directed into the page. The induced current in the loop is: A) counterclockwise B) clockwise C) zero D) up the left edge and from right to left along the top edge E) through the middle of the page 52. Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5.0 Wb. If the page is turned by 30 around an edge the flux through it will be: A) 2.5Wb B) 4.3 Wb C) 5.0 Wb D) 5.8 Wb E) 10 Wb 53. In the experiment shown: L A) there is a steady reading in G as long as S is closed B) a motional emf is generated when S is closed C) the current in the battery goes through G D) there is a current in G just after S is opened or closed E) since the two loops are not connected, the current in G is always zero 54. Faraday's law states that an induced emf is proportional to: A) the rate of change of the magnetic field B) the rate of change of the electric field C) the rate of change of the magnetic flux D) the rate of change of the electric flux E) zero 49, In the figure, there are three wires carrying currents in the indicated directions, and an Amperian loop. The sign of the contribution of the current in each wire to the path integral B- ds in Ampere's Law is: Air+i50 B)ii i2+,i30 O i+, it i3 D)ii - i3+ E)ii+ix iz 50. Magnetic field lines inside the solenoid shown are: I A) clockwise circles as one looks down the axis from the top of the page B) counterclockwise circles as one looks down the axis from the top of the page C) toward the top of the page D) toward the bottom of the page E) in no direction since B=0 51. Asolenoid is 3.0 cm long and has a radius of 0.50 cm. It is wrapped with 500 turns of wire carrying a current of 2.0 A. The magnetic field at the center of the solenoid is: A) 99x108T B) 1.3x103T C) 42x102T D) 16T E) 20T 45. The magnitude of the magnetic field at point P, at the center of the semicircle shown, is given by: R A) 2Moi/R2 B) Moi/2TR C) Moi/4TR D) Moi/2R E) Moi/4R 46. The diagrams show three circuits consisting of concentric circular arcs (either half or quarter circles of radii r, 2r, and 3r) and radial lengths. The circuits carry the same current. Rank them according to the magnitudes of the magnetic fields they produce at C, least to greatest. A) 1, 2, 3 B) 3, 2, 1 C) 1, 3, 2 D) 2, 3, 1 E) 2, 1, 3 47. In Ampere's law, of B . ds = Moi, the integration must be over any: A) surface B) closed surface C) path D) closed path E) closed path that surrounds all the current producing B 48. In Ampere's law, of B . ds = Moi the symbol ds is: A) an infinitesimal piece of the wire that carries current i B) in the direction of B C) perpendicular to B D) a vector whose magnitude is the length of the wire that carries current i E) none of the above