Aeroplane Potential Difference – Magnetic Fields Level 4
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Aeroplane Potential Difference – Magnetic Fields Level 4

September 30, 2019


In this question, an aeroplane travels through
a vertical magnetic field, strength B at a velocity v. The wingspan of the aircraft is
labelled d. The question asks for the potential difference induced across the wingtips of
the aeroplane. Faraday’s law states that the magnitude of the induced emf is equal to the
rate of change of magnetic flux linkage in the wings. Because the wingspan is perpendicular
to the magnetic field, the equation for the magnetic flux linkage is BA, where A is the
area of the object in the magnetic field. By considering the area swept out by the wingspan
of the aircraft per second, and using Faraday’s law, it is possible to find an expression
for the potential difference induced across the wingtips.

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