1. A comb rubbed with the hair several times acquires a net charge of -0.96 C How many electrons were transferred? 2. Three charges are placed in a row: a -3.0-C charge on the left, a +2.0-C charge in the middie, and a +6.0-C charge on the right. The distance separating each charge is 1x10 m. Calculate the electrical force (magnitude and direction) on the +2.0-C charge due to the other charges. 3. The electric field at a point in space is the region in which there would be a force upon a charge brought into that region. Calculate the strength of electric field at a distance of 22.5-m from a charge of 50-C. 4. A solid ball with 0.5-m radius has 10-C electric charges in its center. Determine the electrical flux pass through the solid ball.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!