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Component 3 Light, Nuclei and Options

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How does a changing magnetic flux induce an electromotive force, and what do Faraday's and Lenz's laws tell us?

Electromagnetic induction: magnetic flux and flux linkage, Faraday's law of induction, Lenz's law and energy conservation, and the operation of a simple generator and transformer.
A focused answer to the Eduqas A-Level Physics Component 3 electromagnetic induction content, covering magnetic flux and flux linkage, Faraday's law of induction, Lenz's law and its link to energy conservation, and the operation of a simple AC generator and a transformer.
13 min answer →

How do the inverse-square laws for gravity and electrostatics compare, and how do field strength and potential describe them?

Electrostatic and gravitational fields: Newton's law of gravitation and Coulomb's law, gravitational and electric field strength, the inverse-square law, and gravitational and electric potential.
A focused answer to the Eduqas A-Level Physics Component 2 fields content, covering Newton's law of gravitation and Coulomb's law, gravitational and electric field strength, the inverse-square law, and gravitational and electric potential, treated side by side as Eduqas presents them.
13 min answer →

What force does a magnetic field exert on currents and moving charges, and how is flux density defined?

Magnetic fields: magnetic flux density, the force on a current-carrying conductor F = BIL, the force on a moving charge F = Bqv, and the circular motion of charged particles in a field.
A focused answer to the Eduqas A-Level Physics Component 3 magnetic fields content, covering magnetic flux density, the force on a current-carrying conductor F = BIL, the force on a moving charge F = Bqv, and the circular motion of charged particles moving through a magnetic field.
12 min answer →

How does gravity govern the orbits of planets and satellites, and what is special about a geostationary orbit?

Orbits and the wider universe: circular orbits under gravity, Kepler's third law, the energy of an orbiting body, geostationary satellites, and escape velocity.
A focused answer to the Eduqas A-Level Physics Component 2 orbits content, covering circular orbits under gravity, the derivation of Kepler's third law, the energy of an orbiting body, geostationary satellites, and escape velocity.
13 min answer →

What evidence shows the universe is expanding, and how does Hubble's law lead to the Big Bang?

Orbits and the wider universe: the Doppler effect and redshift, Hubble's law, the age of the universe, and the evidence for the Big Bang including the cosmic microwave background.
A focused answer to the Eduqas A-Level Physics Component 2 cosmology content, covering the Doppler effect and the redshift of galaxies, Hubble's law, estimating the age of the universe, and the evidence for the Big Bang including the cosmic microwave background radiation.
12 min answer →

How do we work out the temperature, size and composition of a star from the radiation it emits?

Using radiation to investigate stars: black-body radiation, Wien's displacement law, Stefan's law and stellar luminosity, the inverse-square law for flux, and stellar spectra.
A focused answer to the Eduqas A-Level Physics Component 2 astrophysics content, covering black-body radiation, Wien's displacement law for stellar temperature, Stefan's law for luminosity, the inverse-square law for radiation flux, and how stellar spectra reveal composition.
13 min answer →