HOMEWORK-CH 22

HOMEWORK-CH 22 - HOMEWORK ASSIGNMENT 1 12 The fact that the...

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HOMEWORK ASSIGNMENT 1 12. The fact that the spheres are identical allows us to conclude that when two spheres are in contact, charge is redistributed so that they possess equal charges. Therefore, when a charged sphere ( q ) touches an uncharged one, they will (fairly quickly) each attain half that charge ( q /2). We start in Fig. 22-20 a with spheres A and B each having charge q and experiencing a mutual repulsive force 2 2 1 / . A B F kq r = When the neutral sphere C touches sphere A in Fig. 22-20 b , sphere A’s charge decreases to q /2. Then sphere C (now carrying charge q /2) is brought into contact with sphere B in Fig. 22-20 c . Their total charge of q /2 + q becomes shared equally between them. Therefore, the charge of sphere B is 3 q /4 in the final situation. The repulsive force between spheres A and B is finally ( 29 ( 29 3 2 2 4 2 1 2 2 3 3 . 8 8 q q A B A B q F k k F r r = = = 36. Consider the charges on the x axis. The +4 e charge at a distance 2 d exerts exactly the
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This note was uploaded on 06/01/2008 for the course PHYS 232 taught by Professor Goksu during the Spring '08 term at Millersville.

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HOMEWORK-CH 22 - HOMEWORK ASSIGNMENT 1 12 The fact that the...

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