Methods of Producing Induced EMF

Faraday's basic emf formula, $\varepsilon=-d\Phi_B/dt$ with $\Phi_B=BA\cos\theta$, shows that an induced emf can be produced by changing ANY one of the three factors that together make up the flux: the magnetic field strength B itself, the enclosed area A of the circuit, or the relative orientation angle $\theta$ between the field and the circuit's normal. This section develops each of these three physically distinct routes as its own ded …