More E fields and B fields



1) What is the direction of the magnetic field experienced at the point below the moving charge?



2) Describe the directions of the electric and magnetic forces experienced by each of the two charges.


3) The picture below shows two parallel wires. The arrows show the direction of the conventional currents passing through the wires. Describe the directions of the electric and magnetic forces experienced by each of the two wires.




4) A conductor moves from South to North. The resulting current moves from West to East. What is the direction of the magnetic field?



5) Current passes through a wire, causing the wire to move North. If the magnetic field is directed from East to West, in which direction is the current?



6) If a conductor is moved from East to West through a magnetic field directed South to North, which way will the current flow?



7) A wire moves from East to West in a magnetic field directed from Up to Down. In which direction will the current flow?



8) The rectangle is made of wire. If an increasing current flows through the wire to the right of the rectangle, in the direction of the arrow, what is the direction of the induced current in the rectangle?








9) What is the strength of the electric field 0.50 m away from an electron? The charge on an electron is negative 1.6 10-19 C.







10) Electrons in an experiment are found to experience the greatest force when moving south through a magnetic field at 1.8 106 m/s. The resulting force is upward and of magnitude 2.6 10-12 N. Find the magnitude and direction of the B field.







11) An alpha particle of charge 3.2 10-19 C and mass 6.6 10-27 kg is emitted from a radioactive source at 1.9 107 m/s, perpendicular to a magnetic field. What field strength would be needed to force the alpha particle into a circular path of radius 0.25 m?







12) A circular loop of wire has a radius of 0.15 m. A 2.5 T magnetic field makes an angle of 25 to the normal to the loop. Calculate the magnetic flux, and be sure to use the proper units for flux.







13) Another circular loop of wire, with a radius of 0.25 m, is perpendicular to a 1.5 T magnetic field. If it makes one-quarter of a rotation in 0.10 seconds, what is the induced voltage in the loop?







14) Yet another circular loop of wire is in the plane of this piece of paper. A perpendicular 0.55 T field points into the paper. If the radius of the loop changes from 0.10 m to 0.025 m in 0.50 s, find the direction of the induced current, and the magnitude of the voltage.