At what distance from a +1.9 nC point charge will the electric field have a magnitude of 2.2 × 105 N/C?
Pause & Predict 2.1.2
What is the electric field produced at point P by a dipole of ±q = 3.2 nC and a dipole separation of d = 750 mm?
A. 72 N/C
B. 144 N/C
C. 102 N/C
D. 46 N/C
E. 330 N/C
Practice!
Practice 2.1.1
A point charge of +7.45 pC (7.45 ´ 10-12 C) is fixed at the origin. What is the electric field produced by this charge at point P, which is on the x-axis, 9.83 mm from the origin?
A. 6.81 N/C
B. 6.81 N/C (-)
C. 693 N/C
D. 693 N/C (-)
E. 5.16 nN/C
F. 5.16 nN/C (-)
Check your answer here: C. 693 N/C
Practice 2.1.2
A point charge of -4.28 pC is fixed on the y-axis, 2.79 mm from the origin. What is the electric field produced by this charge at point P, which is on the x-axis, 9.83 mm from the origin?
A. 101 N/C (-) + 355 N/C
B. 355 N/C (-) + 101 N/C
C. 369 N/C
D. 4940 N/C
E. 398 N/C (- )
Practice 2.1.3
A point charge of +7.45 pC (7.45 x 10-12 C) is fixed at the origin. Another point charge of -4.28 pC is fixed on the y-axis, 2.79 mm from the origin. If you placed a proton at point P, which is on the x-axis, 9.83 mm from the origin, what would be the magnitude of the electric force on that proton?
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