Phy107Lect13

Phy107Lect13 - From last time Superposition of waves...

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Wed. Oct 6 Phy107 Lecture 13 From last time… • Superposition of waves • Interference of waves on a string • Interference of sound waves – Constructive interference – Destructive interference • Superposition of waves with different frequencies – Beat frequencies • Doppler effect – Change in apparent frequency due to motion of source or observer
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Wed. Oct 6 Phy107 Lecture 13 This lecture: Electric and magnetic properties • Electric charge and electric forces • Magnetic forces • Unification of electric and magnetic forces – Lorenz force on moving charged particle – Faraday induction of currents by changing magnetic field.
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Wed. Oct 6 Phy107 Lecture 13 Origin of Charge • Charge is an intrinsic property of matter • Two types: – Positive Charge: Protons – Negative Charge: electrons – Opposites Attract! (likes repel) • Atoms are neutral – Positively charged central nucleus r~10 -15 m – Negatively charged electrons orbit r~10 -10 m
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Wed. Oct 6 Phy107 Lecture 13 Separating Charge • Triboelectric – Charge is transferred by mechanical motion • Conduction – – charge transfer by contact (spark)
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Wed. Oct 6 Phy107 Lecture 13 Measuring charge: electroscope The positively charged rod attracts negative charges to the top of the electroscope. This leaves positive charges on the leaves. The like-charges on the leaves repel each other.
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Wed. Oct 6 Phy107 Lecture 13 ‘Mechanizing’ triboelectric effects • The van de Graf machine continually transfers charge to the ‘dome’ via a moving belt.
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Wed. Oct 6 Phy107 Lecture 13 Van de Graaf The sphere gives the girl a large negative charge. Each strand of hair is trying to: A. Get away from the charged sphere. B.
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Phy107Lect13 - From last time Superposition of waves...

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