[Homework Home > Faraday's_Law_and_Lenz's_Laws] 
[1]  A loop of wire with a diameter of d= m lies in a plane perpendicular to a magnetic field with B= Tesla . The magnetic field is shut off completely in t= seconds . What is the average induced emf in the loop? 
[2]  The rectangular loop shown here is pushed into the magnetic field, that points into you computer screen. What direction is the induced current? 
[3]  The current in the wire is to the left and INCREASING. That is, the current is getting larger and larger. A current gets induced in the loop. In what direction is the induced current? 
[4]  In this figure, a metal rod of length L= meters can slide on two wires connected to a resistor of resistance R= \bigomega . The system is a complete circuit, and is perpendicular to a Bfield with B= Tesla . How large a force would you need to push on the rod with, in order to move it to the right at a speed of v= m/s ? 
[5]  A circular coil has a radius of r= m and is made by winding wire around and around with N= turns . The coil has a resistance of R= \bigomega and is placed in a magnetic field that is perpendicular to the plane of the coil. The magnetic field varies with time according to this function: B(t)=0.01t+0.04t^{2}. Find the induced EMF in the coil when t= seconds 
[6]  A helicopter has blades with a length of L= m . They are in the Earth's magnetic field, which is B=\sn{0.5,4} T. If they spin at \omega= rev/s about the center axis (which is connected to the motor), what is the induced EMF between the blade tip and the central axis? 
[7]  A wire is bent in a semicircle as shown here.
The semicircle has a radius of r= m . The crank is turned, causing the semicircle to rotate in the
magnetic field. The crank is turned at \omega= revs/second and the magnetic field has strength
B= Tesla . Find

[8]  A square coil has 4 sides that measure L= m , and is made of wire wrapped around it N= turns . It rotates about the axis shown at \omega= rpm . It is also immersed in a horizontal magnetic field of strength B= Tesla . What is the maximum EMF induced in the coil? 
[9]  A big solenoid carries a current of i= Amperes and is made from wrapped at n= turns/m . Inside of this solenoid is a small coil with diameter d= m and made of N= turns of wire. The axis of the coil is parallel to the axis of the solenoid. If the current in the large solenoid is reduced to zero (at a steady rate) in t= seconds , what is the EMF induced int the small coil? 