P202_Ch19_HWa - Chapter 19 Electric Charges Forces and...

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Chapter 19 Electric Charges, Forces, and Fields (Homework due by 11:59pm, Jan. 15, 2004,) 1. Find the net charge of a system consisting of 4.52×10 10 electrons and 8.30×10 10 protons. Answer = [6.05] nC nC C C q 05 . 6 10 05 . 6 ) 10 60 . 1 )( 10 30 . 8 10 52 . 4 ( 9 19 10 10 = × = × × + × = 2. A container holds a gas consisting of 3.5 moles of Nitrogen molecules. One in a million of these molecules has lost a single electron. What is the net charge of the gas. Answer = [0.34] C -- make exponent [3,4,5] C 33 . 0 ) C 10 60 . 1 )( 10 )( 10 02 . 6 )( 5 . 3 ( 19 6 23 = × × = q 3. Given the charge 15 μC in the following graph separated by the distance 12 cm. Find the magnitude and direction of the net force on the charge q 1 Answer= [246] N point to the [right] direction x ˆ in the N 246 ˆ ) 75 . 1 ( (0.12m) μC) 15 ( ) C Nm 10 9 ( ˆ ) 4 3 2 ( ˆ ) 2 ( ˆ 2 2 2 2 9 2 2 2 3 1 2 2 1 1 + = × = = = x x d q k x d q q k x d q q k F G 4. Find the magnitude of the net electrostatic force exerted on the point charge q 2 . Let q=[4.2] μC and d=[25] cm.
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