physics_204_exam2_08

physics_204_exam2_08 - Unit Exam I: Problem #1 (Spring '08)...

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Unit Exam I: Problem #1 (Spring ’08) Consider two point charges positioned in the xy -plane as shown. (a) Find the magnitude F of the force between the two charges. (b) Find the components E x and E y of the electric field at point O . (c) Find the electric potential V at point O . (d) Find the potential energy U of charge q 2 in the presence of charge q 1 . x q = +8nC q = -4nC O 3m 4m 2 1 y 18/2/2008 [tsl374 – 6/12]
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Consider two point charges positioned in the xy -plane as shown. (a) Find the magnitude F of the force between the two charges. (b) Find the components E x and E y of the electric field at point O . (c) Find the electric potential V at point O . (d) Find the potential energy U of charge q 2 in the presence of charge q 1 . x q = +8nC q = -4nC O 3m 4m 2 1 y Solution: (a) F = k | q 1 q 2 | (5m) 2 = 1 . 15 × 10 - 8 N . (b) E x = - k | q 2 | (4m) 2 = - 4 . 5N / C , E y = + k | q 1 | (3m) 2 = +4 . 0N / C . (c)
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physics_204_exam2_08 - Unit Exam I: Problem #1 (Spring '08)...

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