Top Tweets for #genphys2

4 months ago

Today in #PHY202 #GenPhys2: The final exam covering oscillations, waves, electricity, magnetism, electromagnetic waves and optics, and wave-particle duality.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: The final exam covering oscillations, waves, electricity, magnetism, electromagnetic waves and optics, and wave-particle duality. https://t.co/usIfH83ekR

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Tom Wong @thomasgwong

5 months ago

Today in #PHY202 #GenPhys2: Changing the magnetic flux through a loop induces an electromotive force in the loop, driving a current (Faraday's law). The induced current creates a magnetic field that opposes the change in magnetic flux (Lenz's law).

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Tom Wong @thomasgwong

5 months ago

Last time in #PHY202 #GenPhys2: Current moving through a wire creates a magnetic field around the wire, whose direction is given by a right-hand rule. In turn, this magnetic field can exert a force on moving charges, including moving charges in other wires.

thomasgwong's tweet photo. Last time in #PHY202 #GenPhys2: Current moving through a wire creates a magnetic field around the wire, whose direction is given by a right-hand rule. In turn, this magnetic field can exert a force on moving charges, including moving charges in other wires. https://t.co/4jVPfuSuUr

221

Tom Wong @thomasgwong

6 months ago

Lately in #PHY202 #GenPhys2: A charge moving in a magnetic field experiences a force in a direction determined by a right-hand rule. A current-carrying wire contains moving changes, and so it experiences a force. A current-carrying loop has no net force, but it can have a torque.

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Tom Wong @thomasgwong

6 months ago

Yesterday in #PHY202 #GenPhys2: As a mass falls, its gravitational potential energy is converted to kinetic energy. As a positive charge moves along an electric field, its electric PE is similarly converted to KE. Electric PE is related to electric potential by ΔU = qΔV.

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Tom Wong @thomasgwong

6 months ago

Lately in #PHY202 #GenPhys2: In a topographical map, contour lines show points of equal elevation. Steepness is indicated by the closeness of contour lines. Similarly, equipotential surfaces show points of equal voltage, and the "steepness" gives the electric field.

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Tom Wong @thomasgwong

6 months ago

Lately in #PHY202 #GenPhys2: Like charges repel, and opposite charges attract. The force is given by Coulomb's law. But how does a charge exert a force on another from a distance? It emits a "smell" called an electric field.

361

Tom Wong @thomasgwong

7 months ago

Lately in #PHY202 #GenPhys2: (1) For small angles, pendula exhibit simple harmonic motion. Oscillations can be damped and/or driven. (2) A wave is a traveling disturbance. Motion shifts a sound wave's frequency (Doppler). Interference explains beats and standing waves.

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Tom Wong @thomasgwong

7 months ago

Today in #PHY202 #GenPhys2: A mass on a spring oscillates sinusoidally. The position, velocity, and acceleration of the mass is graphed below.

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Tom Wong @thomasgwong

8 months ago

Today in #PHY202 #GenPhys2: Course, professor, and student introductions. Students took a conceptual survey of electricity and magnetism, which they'll also take at the end of the semester, to help assess our teaching.

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Tom Wong @thomasgwong

8 months ago

Happy Spring 2026 semester! I'm teaching: 1. #PHY202 General Physics for the Life Sciences 2 #GenPhys2 2. #PHY471 #ClassicalMechanics 3. #PHY533 #QuantumComputing (my textbook)

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Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: The final exam! Students, you've learned a lot of physics this year, and no matter your final grade in the course, we're proud of you and how far you've come.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: The final exam! Students, you've learned a lot of physics this year, and no matter your final grade in the course, we're proud of you and how far you've come. https://t.co/gtT7Ul6Un6

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: Einstein explained the photoelectric effect by proposing that light, previously discussed as waves, is made of particles (photons). Louis de Brogle proposed that particles are waves. This dual nature of things is called particle-wave duality.

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: Single-slit diffraction. There's a nice simulation at https://t.co/SAExyrv7lq, pictured below.

$thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: Single-slit diffraction. There's a nice simulation at https://t.co/SAExyrv7lq, pictured below. https://t.co/cyLU7vEPkC$

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: Thin film interference. When the path length difference is an integer or half-integer multiple of the wavelength in the film, we get constructive or destructive interference, depending on the hard/soft reflections. Picture from https://t.co/KOtJi3h9Up.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: Thin film interference. When the path length difference is an integer or half-integer multiple of the wavelength in the film, we get constructive or destructive interference, depending on the hard/soft reflections. Picture from https://t.co/KOtJi3h9Up. https://t.co/yl73ztnnxW

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: The third midterm! It's on magnetism and electromagnetic waves, including induction, reflection, and refraction.

$thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: The third midterm! It's on magnetism and electromagnetic waves, including induction, reflection, and refraction. https://t.co/hnKGmkLJyU$

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: Electromagnetic waves! Electric and magnetic fields are transverse waves, perpendicular to each other, traveling at 3x10^8 m/s in a vacuum. Depending on their frequency/wavelength, they are used for cell phones, Wi-Fi, visible light, x-rays, and more.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: Electromagnetic waves! Electric and magnetic fields are transverse waves, perpendicular to each other, traveling at 3x10^8 m/s in a vacuum. Depending on their frequency/wavelength, they are used for cell phones, Wi-Fi, visible light, x-rays, and more. https://t.co/VDZ7eFMfZa

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: We spent the entire lecture doing examples of electromagnetic induction / Faraday's law. Here's an example.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: We spent the entire lecture doing examples of electromagnetic induction / Faraday's law. Here's an example. https://t.co/5LigJ1ZhKM

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: A changing magnetic flux induces a voltage given by Faraday's law. This can give rise to an induced current, and from Lenz's law, it creates a magnetic field that opposes the change in flux.

thomasgwong's tweet photo. Today in #PHY202 #GenPhys2: A changing magnetic flux induces a voltage given by Faraday's law. This can give rise to an induced current, and from Lenz's law, it creates a magnetic field that opposes the change in flux. https://t.co/T7mZWPG7zI

Tom Wong @thomasgwong

over 5 years ago

Today in #PHY202 #GenPhys2: A current-carrying loop is placed in a uniform magnetic field (pictured). There's a net torque that spins the loop! Its magnitude is iNABsin(θ), where i = current, N = # turns, A = area of loop, B = magnetic field, θ = angle between A and B.

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