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Physics 1 Problem Solutions 181

# Physics 1 Problem Solutions 181 - Chapt 22 Electric Charge...

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Chapt. 22 Electric Charge 177 a) Given that copper’s atomic mass is 63 . 5 in atomic mass units (i.e., in units of 1 . 66 × 10 27 kg), how many copper atoms are there in the penny? HINT: If you have 10 kg of eggs and each egg weighs 50 g, then you how many eggs? b) Given that a copper atom has 29 protons (i.e., atomic number Z=29), how much gross positive charge in Coulombs does the penny have? c) Imagine (contrafactually as they say in Washington) that the absolute value of the elementary proton charge was 1 . 000001 times larger than the absolute value of the elementary electron charge (i.e., there was a fractional charge difference of ( δe/e ) = 10 6 ), what would be the force between two pennies a distance 1 meter apart assuming that the pennies would be neutral if there were no fractional charge difference. d) Is a charge difference between proton and electron of the order suggested in the part (c) question likely? Explain. 022 qfull 00200 3 3 0 tough math: a vector calculation with charges 3. Four point charges are set at the corners of a square 2 meters on a side. Going clockwise from
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