State that:
what the term magnetic field means,
an expression for the magnetic flux $\Phi$ through plane PQRS, written in terms of $A$, $B$ and $\theta$.
A vertical aluminium window frame DEFG is $52\,\text{cm}$ wide and $95\,\text{cm}$ long, as shown in Fig. 5.2. It is hinged along the vertical edge DG. The Earth's horizontal magnetic-field component $B_H$ is $1.8 \times 10^{-5}\,\text{T}$. When the window is closed, the frame is normal to the horizontal component $B_H$. The window is then opened so that the plane of the window turns through $90^\circ$.
Explain why opening the window produces no change in magnetic flux linkage from the vertical component of the Earth’s magnetic field.
Calculate the change in magnetic flux linkage when the window opens through $90^\circ$.
State Faraday’s law of electromagnetic induction briefly.
The window in (b) is opened in $0.30\,\text{s}$. Use your answer to (b)(ii) to work out the average e.m.f. induced in the window frame.
State which sides of the window frame have the e.m.f. induced between them.