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Charge and Coulomb's Force Law

# Charge and Coulomb's Force Law - Plastic rod w charge Glass...

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Plastic rod w/ charge 20μC p Q = − Glass rod w/ charge 30μC g Q = + Rub them together, then find that plastic rod still has 5μC p Q =− What’s g Q ? net 10μC pg QQ Q = += + net 15μC gp QQQ =

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#1 #2 mass m 1 = 40 g charge Q 1 = +20 µ C mass m 2 = 8 g charge Q 2 = +32 µ C Separation d = 10 cm What is the force on ball #1? () 2 12 2 22 Nm (32μC)(20μC) 9 9 576N C 0.1m QQ kE r ⎛⎞ == = ⎜⎟ ⎝⎠ F TO THE LEFT! What is the force on ball #2?
+1 q -2 q +4 q -3 q L L Four small charged objects are in a square. L = 1m and q = 1 µ C. What force does the upper right object feel? F 1 F 2 F 3 222 2 1 6/ ( 2 ) 3/ Fk q L k q L == ii 22 2 8/ F kq L = i 3 2/ F kqL = i 3 ( 2) / 0.00109 N 2 x q L =− =

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Charge and Coulomb's Force Law - Plastic rod w charge Glass...

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