Example 21-6: Electric field of a single point charge. a. Calculate the magnitude and direction of the electric field at a point P which is 30 cm to the right of a point charge Q = -3.0 x 106 C. -30 cm Q = -3.0 x10-6 C b. Calculate the magnitude and direction of the electric field at a point P which is 30 cm to the right of a point charge Q = 3.0 x 10-6C. -30 cm P Q =+3.0 x 10-6C
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