Current and Resistance Electric Charge and Coulomb`s law Lecture 20 Monday: 29 March 2004.

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Presentation transcript:

Current and Resistance Electric Charge and Coulomb`s law Lecture 20 Monday: 29 March 2004

Charge (q) q is measured in coulombs (C) q can be + or – q is conserved q is quantized The elementary charge is: e = 1.6 × C

Forces on Charges Unlike charges attract. Like charges repel.

Coulomb’s Law

Central Force (acts along the line connecting the two objects) “one over r squared force” Is mathematically identical to gravitational force. But they are not the same force.

ELECTROSTATIC VS. GRAVITATIONAL FORCE Electron: m e = 9.11 × kg q e = – e = – 1.6 × C Proton: m p = 1.67 × kg q p = e = 1.6 × C

ELECTROSTATIC VS. GRAVITATIONAL FORCE A proton and an electron are attracted to each other by two forces:

ELECTROSTATIC VS. GRAVITATIONAL FORCE

Comparison of Gravity and Electrostatic Force