1. A square loop of wire sits in a uniform magnetic field as shown in figure 1 b

Question

1. A square loop of wire sits in a uniform magnetic field as shown in figure 1 below. The magnetic field is into the page. A current goes counterclockwise around the loop as shown. The direction of the net force on the segment CAB is (Explain your answer clearly!)

a) zero

b) left

c) right

d) southeast

2. In figure 2, two capacitor plates are charged. A long straight wire passes between the plates carrying a current into the page. An electron is at the position shown with a constant velocity in a certain direction. In what direction must the electron be moving, for it to remain at a constant velocity? (Explain your answer!)

a) +y

b) -y

c) +z

d) -z

a) zero

b) left

c) right

d) southeast

Explanation / Answer

a)F=i(lXB)

so we have to vectors

F=i((-li-lj)XBok)

=ilB(i-j)

so the force is in south east direction

b)the electron should be moving parallel to the y axis

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