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Physics 212 Exam 1
• Greater Credit will be given if you show your working.
• In a vacuum, two particles have charges of q1 and q2 , where q1 = 3.5µC.
They are separated by a distance of 0.26m and particle 1 experiences an
attractive force of 3.4N. What is q2 (magnitude and sign)?
• Two spherical shells have a common center. A charge of −1.6 × 10−6 C
is spread uniformly over the inner shell, which has a radius of 0.05m. A
charge pf +5.1 × 10−6 C is spread uniformly over the outer shell which has a
radius of 0.15m. The surface area of a sphere of radius r is 4πr 2. Explaining
your reasoning carefully, find the magnitude and direction of the electric
field at a distance (measured from the common center of the two shells) of
a) 0.19m b) 0.11m c) 0.024m.
• In the rectangle in figure 1, a charge is to be placed at the empty corner to
make the net force on the charge at the corner A point along the vertical
direction. What charge (magnitude and algebraic sign) must be placed at
the empty corner?
• The drawing in figure 2 shows 6 point charges arranged around a rectangle.
The value of q is 9.0µC and d = 0.13m. Find the total electric potential at
P - the center of the rectangle.
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