Electrostatic Force – Coulomb’s Law e law of electric charges is evidence of a force between any two charges at rest Experiments show that for the electrostatic force exerted by charge 2 (q2) on charge 1 (q1), the force on q1points toward q2if the charges have opposite signs and away from q2if the charges have like signs September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 2
Electrostatic Force – Coulomb’s Law Coulomb’s Law gives the magnitude of this force as kis Coulomb’s constant given by We can relate Coulomb’s constant to the electric permittivity of free space ε0 September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 3 F=kq1q2r2q1and q2are electric chargesr=r1−r2is the distance between the chargesk=8.99⋅109N m2C2k=14πε0, ε0=8.85⋅10−12C2N m2
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September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 5 Force between Two Charges PROBLEM What is the magnitude of the force between two 1.00 C charges 1.00 m apart? SOLUTION is force is approximately the same as 450 loaded Space Shuttles!F=kq1q2r2F=8.99⋅109N m2C2⎛⎝⎜⎜⎜⎞⎠⎟⎟⎟⎟1.00 C()21.00 m()2F=8.99⋅109N