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Grade 11 Physics – Electric Field Problems
1. A negative test charge of 2.0 x 10-8 C experiences a force of 0.060N [right] in an
electric field created by a positive 6.8 x 1010C charge located to the right of the
negative test charge. What is the magnitude and direction of the electric field
where the test charge is located?
2. A positive test charge of 3.75 x 1013 ec is in an electric field of 50.0 N/C [East].
What is the magnitude and direction of the force exerted on the charge?
3. Perform the following conversions.
a. 8.0 C to ec.
b. 6.4x1015 N/ec to N/C.
c. 8.00x10-18 N/C to N/ec
4. A charge of – 3.0 C is in an electric field of 60 000.0 N/C [up]. What is the
magnitude and direction of the force on the charge?
5. A charge of + 6.0 ec has a force of 4.8x10-15 N [Left] acting on it. What is the
magnitude and direction of the electric field there?
6. When in an electric field of 25 000 N/C [South] a charge had a force of 0.80 N
[North] on it.
a. Calculate the charge on this object.
b. How many electrons has it lost or gained?
7. In a Millikan experiment the electric field between the parallel plates was
88 000 N/C [up]. A drop with a mass of 4.3x10-15 kg was held in balance. What
was the charge on this drop in Coulombs?
8. In a Millikan apparatus an electric field of 1.47 x 10 6 N/C [up] was enough to
hold an oil drop in balance. The drop of oil had a mass of 2.4 x 10 – 14 kg.
a. Is the top plate positive or negative?
b. How many electrons has the drop gained or lost?
9. An oil drop with a mass of 4.20 x 10-15 kg had a charge of – 3.00ec and is
between parallel plates. There is an electric field of 130 000.0 N/C [down]
between the plates. What is the magnitude and direction of the acceleration of the
drop?
K. Byrnes
PHY30S
Grade 11 Physics – Electric Field Problems Answers
1. 3.0 x 106 N/C [left]
2. 3.00 x 10-4 N [East]
3. (a) 5.0 x 1013 ec
(b) 4.0 x 1034 N/C
(c) 1.28 x 10-30 N/ec
4. 0.18 N [down]
5. 8.0 x 10-16 N/ec [Left]
6. (a) – 3.2 x 10-5 C
(b) 2.0 x 1014 electrons gained
7. +4.8 x 10-19 C
8. (a) negative
(b) 1 electron lost
9. 5.06 m/s2 [up]
K. Byrnes
PHY30S