University of Ontario Institute of Technology

PHY 1040U

PHY1040U MIDTERM I
February 10, 2016
2:10 – 3:20 pm





















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&,(This study source was downloaded by 100000878898342 from CourseHero.com on 02-07-2024 21:46:49 GMT -06:00
https://www.coursehero.com/file/48694401/Midterm1-Solution-marking-schemedocx/
SECTION I (Short Questions)
1. A point charge of +3.00 μC is 12.0 cm distant from a second point charge of -1.50 μC.
Calculate the magnitude and direction of the force on each charge. [2 marks]
q1=3 . 00×10−6 C
q2=−1 . 50×10−6 C
r=0. 12 m
|F|=k e
|q1|⋅|q2|
r2
(Note: F is the same for both charges, direction is
attractive)
Substituting the appropriate values we get:
|F|=2 . 81×10−12 NThis study source was downloaded by 100000878898342 from CourseHero.com on 02-07-2024 21:46:49 GMT -06:00
https://www.coursehero.com/file/48694401/Midterm1-Solution-marking-schemedocx/
P(2m, 5m)
q
2. A charge q = -5.00 μC is placed at the origin of the x-y coordinate system. What is the
magnitude and direction of the electric field at a point P (2m, 5m). [3 marks]
r=√22+ 52=√29