PHYS 101 Midterm: UIUC PHYS 101 101 SP10 HE1Solved
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Note that there are several variations of some problems, indicated by choices in parentheses. What is the total enclosed charge in the shown cube if the electric field is given by. Because of the directions of the electric field, the flux could only be non- zero for the top- bottom and left- right faces. However, because the field also depends on y, the only non- zero contribution is for the top face. The left and right faces have a constant field and so no net flux. qenc. Recall that flux is positive when the field points out from a closed surface. Note that the electric field contributions from q1 and q3 cancel since the charges are equal. The charges q2 and q4 are unequal, so the net imbalance is. +q (or +2q) in the location of q2. Two identical conducting spheres are separated by a fixed distance of d=30cm, which is much larger than the sphere radius.
