Magnetic flux depends upon: a) the magnetic field b) the area involved c) the orientation of the area with respect to the field d) all of the above 13.a wire of radius r carries a current (t) of uniform current density. the magnitude of the magnetic field at r/2 is: 2mr b) tr d) 14. a beam of electrons is sent horizontally down the axis of a tube to strike a fluorescent screen at the end of the tube. on the way, the electrons encounter a magnetic field directed vertically downward. the spot on the screen will therefore be deflected: a) upward b) downward c) to the right as seen from the electron source d) to the left as seen from the electron source e) not at all 15. a "coulomb" is: a) one ampere per second b) the quantity of charge that will exert a force of 1n on a similar charge at a distance of 1m by 1m, that produces a force of 2 x 107 n/m current is 1a second c) the amount of current in each of two long parallel wires, separated d) the amount of charge that flows past a point in one second when the e an abbreviation for a certain combination of kilogram, meter, and 16.the si unit "tesla” is equivalent to a) 1 n(a*m) b) 1 wb/m2 c) 101 gauss d) all of the above