 [Homework Home > Faraday's_Law_and_Lenz's_Laws]

  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? The rectangular loop shown here is pushed into the magnetic field, that points into you computer screen. What direction is the induced current? 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? 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 B-field 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 ?

  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+0.04t2. Find the induced EMF in the coil when t= seconds

  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? A wire is bent in a semi-circle as shown here. The semi-circle has a radius of r= m . The crank is turned, causing the semi-circle to rotate in the magnetic field. The crank is turned at \omega= revs/second and the magnetic field has strength B= Tesla . Find The frequency of the EMF induced in the semi-circle. The amplitude of the EMF induced in the semi-circle. 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?

  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?