A simple alternator is a device that generates an emf. A rectangular loop is rotated with constant angular speed w about the axis shown. The magnetic field is uniform and constant. At time t = 0,0 = 0. Determine the induced emf.

A power line carries a current I = 100 sin(380t), where I is in amps and t is in seconds. A clever engineering student wants to steal power by inducing emf in a rectangular loop of copper wire as shown below. If the student wants to induce a maximum emf in the loop equal to 1.7 V, what should be the length L of the loop? Assume that the magnetic field produced by the power line is uniform inside of the rectangular loo and equal to the magnetic field at the center of the loop. 5 mi To equipment I 0.5 m

Motional EMF Below is a rectangle that is being pulled into a magnetic field as shown. The rectangle has a height of h = 0.400 m and is being pulled to the right with a velocity of v = 188.0 m/s. This magnetic field starts where shown, so the left most side of the rectangle has no magnetic field. There is 1 loop with a total resistance of R = 15.40 Ohms. The magnetic field has a magnitude of B = 34.0 mT. That means as the loop moves to the right, the magnetic flux inside the loop is increasing. Magnetic Field (out of the page) Direction of velocity What is the induced current within the wire in this system? (Use a negative sign for clockwise current) Make sure to give your answer with appropriate significant figures and remember that you are looking for a magnitude. Your Answer: Answer units Height

Answer c

A conducting rod slides over two horizontal metal bars with a constant speed v to the left. The entire set up is in a region of uniform magnetic field that is perpendicular to the plane of the rod and bars. If the induced current through the resistor is as indicated, what is the direction of the magnetic field? R M out of the page into the page I V*

You drop a magnet north pole side down from a height (h) into a loop of wire, inducing a current. Draw a graph showing how the induced current in the loop depends on time as the magnet falls through the loop. Does the magnitude of the induced current depend on h?

A circular loop with a radius of 0.21 m is rotated by 90.0° over 0.210 s in a uniform magnetic field with  B = 1.40 T.  The plane of the loop is initially perpendicular to the field and is parallel to the field after the rotation. (a) What is the average induced emf in the loop? V(b) If the rotation is then reversed, what is the average induced emf in the loop? V