Q-1; Multiple Choice: For a negative point charge, the electric field vectors:
w) circle the charge
x) point radially in toward the charge
y) point radially away from the charge
z) cross at infinity
ANSWER: X -- POINT RADIALLY IN TOWARD THE CHARGE
Q-2; Multiple Choice: For an infinite sheet of positive charge, the electric field lines:
w) run parallel to the sheet of charge
x) are perpendicular to the sheet of charge and point in toward the sheet
y) are perpendicular to the sheet of charge and point away from the sheet
z) fall off as one over r squared
ANSWER: Y -- ARE PERPENDICULAR TO THE SHEET OF CHARGE AND POINT AWAY
Q-2; Multiple Choice: Five coulombs of charge are placed on a thin-walled conducting
shell. Once the charge has come to rest, the electric potential inside the hollow conducting shell is
found to be:
w) zero
x) uniform inside the sphere and equal to the electric potential on the surface of the sphere
y) smaller than the electric potential outside the sphere
z) varying as one over r squared.
ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE ELECTRIC OTENT
Q-3; Short Answer: A two farad and a four farad capacitor are connected in series. What
single capacitance is "equivalent" to this combination?
ANSWER: 4/3 FARADS
