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Related Concept Videos

Electric Charges01:11

Electric Charges

From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the four fundamental forces of nature. It has been known to humanity in various forms for thousands of years. For example, the ancient Greek philosopher Thales of Miletus recorded his experiments on static electricity using amber and fur in the sixth century BC.
The English physicist William Gilbert studied the phenomenon of static electricity in...
Charge on a Conductor01:26

Charge on a Conductor

An interesting property of a conductor in static equilibrium is that extra charges on the conductor end up on its outer surface, regardless of where they originate. Consider a hollow metallic conductor with a uniform surface charge density. Since the conductor itself is in electrostatic equilibrium, there should not be any electric field inside the conductor. Now, assume a Gaussian surface enclosing the hollow portion. Applying Gauss's law, the inner surface of the hollow conductor will not...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Coulomb's Law and The Principle of Superposition01:15

Coulomb's Law and The Principle of Superposition

Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically?
The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of the...
Second Uniqueness Theorem01:16

Second Uniqueness Theorem

Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

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Related Experiment Video

Updated: May 19, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

Published on: August 27, 2019

Does lightning strike twice?

Choo Qi Qi1, Vivek Ajit Singh

  • 1Orthopaedics Department, University Malaya, Kulala Lumpur, Malaysia.

BMJ Case Reports
|August 16, 2012
PubMed
Summary
This summary is machine-generated.

This case study follows a patient with five distinct tumors, including hepatoma, sarcoma, adenocarcinoma, meningioma, and schwannoma. The patient remains alive, highlighting the complexities of managing multiple, diverse neoplastic conditions.

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Light/dark Transition Test for Mice
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Last Updated: May 19, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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Published on: August 27, 2019

Light/dark Transition Test for Mice
10:35

Light/dark Transition Test for Mice

Published on: November 13, 2006

Area of Science:

  • Oncology
  • Pathology
  • Medical Case Studies

Background:

  • This report details a rare clinical case involving a patient with a history of multiple, distinct neoplastic conditions.
  • Understanding the development and progression of diverse tumor types in a single individual is crucial for advancing cancer research.

Observation:

  • The patient has been diagnosed with five different types of tumors throughout their life.
  • These include hepatoma, pleomorphic sarcoma of the thigh, adenocarcinoma of the prostate, meningioma, and schwannoma.

Findings:

  • The patient has survived multiple diagnoses of varied pathologies, demonstrating resilience and potentially unique biological factors.
  • The case presents a unique challenge in long-term oncological management and surveillance.

Implications:

  • This case underscores the importance of comprehensive, lifelong monitoring for patients with a history of cancer.
  • Further research into the genetic and environmental factors contributing to multiple primary tumors could offer new therapeutic strategies.