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lecture 2

# lecture 2 - Potential energy Electrical PotentialE E Energy...

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Potential energy E E Energy can be stored in an electric field in a way analogous to that in the gravitational field. Recall: P. E. grav = U = -Work hi to hf = mgh E E So, U elec = - W e-field Electrical Potential Energy Plotting Potential 1 Electrical Potential

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Potential Energy from Multiple Charges le of superposition . Energy is NOT a vector. So we can simply add the potential energy contribution from each charge. ion distance between charges 1 and i. U elect = k q 1 q 2 + q 1 q 3 + q 1 q 4 + . . . + q 1 q i I r 12 r 13 r 14 r 1 i Electric Potential and Potential Difference E E Note the Electric Force vector points toward lower electric potential energy. E Electric Field vector points in direction of lower Electric Potential (V). U elec = qV so W e l e c = qV ~ E points in the direction of decreasing V Potential from a single charge The electric potential energy of a point charge, q , at a distance, r , from a charge Q is: U elec = k gQ r So, the electric potential at a distance, r , from charge Q is: V = k Q r 2 Electric Potential vs Electric
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lecture 2 - Potential energy Electrical PotentialE E Energy...

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