Electrostatics

Charge and Coulomb's Law

Video Lecture RealVideo®
12:03 minutes (7:15 - 19:18)

Charging a glass rod with silk, then inducing a polarization of charge in a conductor. Properties of conductors. Demonstration: Using balloons to demonstrate induction of positive and negative charges with conductors and non-conductors.

Instructor: Prof. Walter Lewin
Prior Knowledge: None
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Video Lecture RealVideo®
6:22 minutes (19:18 - 25:40)

Friction creates a charge when combing your hair, touching a doorknob after walking on a carpet, using saran wrap and cellophane. Experiment: Beating a student with cat fur to create a charge, then discharging by touching a neon discharge tube.

Instructor: Prof. Walter Lewin
Prior Knowledge: None
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Video Lecture RealVideo®
3:50 minutes (25:40 - 29:30)

Demonstration of a Van de Graaff generator used to charge confetti, causing it to jump in the air.

Instructor: Prof. Walter Lewin
Prior Knowledge: None
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Video Lecture RealVideo®
5:48 minutes (42:00 - 47:48)

Definition of electroscope as a device for measuring charge. Professor Lewin demonstrates a human electroscope by charging himself with the Van de Graaff and holding pieces of tinsel.

Instructor: Prof. Walter Lewin
Prior Knowledge: None
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Electric Field & Electric Potential (Including Point Charges)

Video Lecture RealVideo®
6:36 minutes (26:33 - 33:09)

Using a charged rubber rod and two metal spheres to create a dipole. An electroscope is used to show that a dipole has been created.

Instructor: Prof. Walter Lewin
Prior Knowledge: Dipoles (22:28 of VL2), Electroscopes (42:00 of VL1)
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Video Lecture RealVideo®
7:47 minutes (33:09 - 40:56)

Torque on a dipole in an electric field causes it to rotate and align with the field. Demonstration by creating a dipole and placing it in the electric field of a large Van de Graaff generator.

Instructor: Prof. Walter Lewin
Prior Knowledge: Dipoles (22:28 of VL2), Electric Field (Beginning of VL2)
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Video Lecture RealVideo®
4:48 minutes (40:56 - 45:44)

Demonstration of using grass seeds in oil to probe an electric field, with examples of the field for a dipole and for two charges of the same polarity.

Instructor: Prof. Walter Lewin
Prior Knowledge: Electric Field (Beginning of VL2)
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Video Lecture RealVideo®
3:40 minutes (45:44 - 49:24)

Using a balloon to demonstrate the electric field between a Van de Graaff generator and an oppositely charged Professor Walter Lewin.

Instructor: Prof. Walter Lewin
Prior Knowledge: Electric Field (Beginning of VL2)
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Video Lecture RealVideo®
6:04 minutes (42:57 - 49:01)

Using a large Van de Graaff generator and a flourescent tube to show that there is a very large potential difference in a strong electric field.

Instructor: Prof. Walter Lewin
Prior Knowledge: Electric Potential (7:14 of VL4)
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Video Lecture RealVideo®
8:37 minutes (11:53 - 20:30)

Electrocardiograms, defibrillators, and pacemakers are explained, including a demonstration of an electrocardiogram on a student.

Instructor: Prof. Walter Lewin
Prior Knowledge: How Your Heart Works Pt. 1 (3:00 of VL19)
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