A closed loop conductor with radius 2.0 m is located in a changing magnetic field. If the maximum emf induced in the loop is 2.0 V, what is the maximum rate at which the magnetic field strength is changing if the magnetic field is oriented perpendicular to the plane in which the loop lies? O 0.16 T/s O 1.0 T/s O 2.0 T/s O 0.080 T/s

A wire coil of 30 turns has a cross-sectional area of 12 cm2. The coil is placed in a uniform field of a large magnet with B = 0.27 T. The coil is suddenly rotated 90 o from an orientation parallel to the field to one perpendicular to the field. The time to flip the coil is 0.57 s.  What is the magnitude of the average emf produced?  What will be the average current produced if the circuit of the coil is closed and the resistance is 55 ohm?

7

Suppose you have a long, skinny conductor that is oriented with its long axis parallel to a uniform magnetic field. Suppose also that the conductor is moving along its long axis in a straight line at constant velocity v. Despite the motion of the conductor, no motional emf is induced. Why? The magnetic field is too uniform The velocity has no component normal to the magnetic field The velocity is too low The conductor is so long and so thin that its electrical resistance is too high

An L = 49.0 cm wire is moving to the right at a speed of v = 6.50 m/s across two parallel wire rails that are connected on the left side, as shown in the figure. The whole apparatus is immersed in a uniform magnetic field that has a magnitude of B = 0.770 T and is directed into the screen. What is the magnitude & of the emf induced in the wire? E= The induced emf causes a current to flow in the circuit formed by the moving wire and the rails. In which direction does the current flow around the circuit? counterclockwise clockwise If the moving wire and the rails have a combined total resistance of 1.35 92, what applied force F would be required to keep the wire moving at the given velocity? Assume that there is no friction between the moving wire and the rails. V F = N

A 5-turn conducting loop with a radius of 3.0 cm with axis of rotation in the plane of the paper spins at 60 revolutions per second in a magnetic field of 0.50 T that is perpendicular to the paper. The maximum emf generated is:     0.14 V     8.3 V     28 V      2.7 V     10.5 V

A segment of wire 7.4 cm long is moving at a velocity of 7.08 m/s toward a parallel (much longer) wire which carries a current of 7.55 A. At a particular instant the wire segment is 5.4 cm away from the long, current-carrying wire. What is the induced emf (voltage) between the two ends of the wire segment?     1.47E-05 V     5.88E-06 V     1.18E-05 V     1.91E-05 V