electromagnetism articles
Does a magnetic field exert a force on a stationary charged particle?
According to the Lorentz force law, what is the geometric relationship between the magnetic force vector (F) and the velocity vector (v)?
Under what specific condition is the magnetic force exerted on a charged particle zero?
Why does the magnetic force perform no net work on a moving charged particle?
What trajectory results if a charged particle's initial velocity is entirely perpendicular to a uniform magnetic field?
What combination of velocity components leads to a helical path for a charged particle in a magnetic field?
How is the radius of the resulting circular or helical path dependent on the particle's momentum (mv)?
What fundamental phenomenon is the source of magnetic fields in surrounding space?
How do magnetic field lines fundamentally differ from electric field lines regarding their structure?
What is the primary function of dipole magnets within a particle accelerator ring?
What is the fundamental role of an antenna according to the text?
What type of electrical signal is required to power wave transmission by an antenna?
What physical phenomenon is responsible for the creation and radiation of electromagnetic waves?
How is the physical size of an antenna fundamentally related to the signal being transmitted?
What characterizes the electric and magnetic fields in the antenna's near field region?
For a wave to transmit successfully as a propagating electromagnetic wave, what transition must occur in the fields?
What relationship describes how antenna Gain relates to Directivity?
What occurs if the impedance of the transmitter does not closely match the impedance of the antenna?
What value approximates the intrinsic impedance of free space ($\eta_0$) that an antenna should align with for optimal propagation?
How are frequency ($f$) and wavelength ($\lambda$) linked for electromagnetic waves traveling in free space?