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Electric Field Practice
1. Calculate the electric field at 2.0m, 0.2 m, and 0.004 m from
a +2 C charge.
2. Calculate the electric field in air at a distance of 30 cm from a
point charge of q= +5.0 x 10-9 C.
3. Draw a diagram of the field lines for a positive point charge.
4. Calculate the electric field 0.5 m from a point charge with a
magnitude of +10.0 C.
5. Determine the electric force acting on an electron placed in a
uniform north to south electric field of 8.0 x 104 N/C.
6. A pith ball with a charge of +0.6C is placed into a region
where there is a uniform electric field with a magnitude of 50
N/C. Determine the size of the electric force acting on the
pith ball.
7. A Styrofoam coffee cup gains a net electric charge when it is
removed from the bag. When the coffee cup is placed in a
region where the electric field has a magnitude of 430 N/C
and is directed from East to West, the coffee cup experiences
a force of 43.6N West. Determine the magnitude and sign of
the electric charge on the coffee cup.
8. A small object of mass 3.80 g and charge -18C “floats” in a
uniform electric field. What is the magnitude and direction
of the electric field? (Hint: Draw a FBD and think of the
gravitational force here on Earth.)
9. A +2C charge sits at 0.0m and is collinear with a +6C charge
at 0.75m. Determine the net electric field at the mid-point
between the charges.
10. A -6C charge is 0.56m to the left of a -7C. Find the net
electric field 0.5m to the right of the -7C charge.
Charges q1 and q2 are at points of 0m and 3m on the x-axis,
respectively. If q1= +5C and q2 = -6C, determine the net electric field
at Point A if Point A is at 5m on the x-axis.
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