Interaction

Electricity and Magnetism Level 2

An airplane flies from East to West around the world. Which of the following is true?

It doesn't interact with Earth's magnetic field lines An emf is induced between the wingtips The weight will always exceed the lift and the plane falls

Ethan Mandelez by Ethan Mandelez , 15, Malaysia

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1 solution

Ethan Mandelez
Dec 21, 2020

The Earth has it's own magnetic field, so the plane's wings will cut the Earth's magnetic field lines, hence an emf is induced across it's wingtips.

1 Helpful 0 Interesting 0 Brilliant 2 Confused

In order for a voltage to be induced in the plane, there has to be a changing magnetic flux through the plane. Due to the symmetry of the Earth's magnetic field about the Earth's axis, the flux through the plane should remain uniform as the plane travels from East to West. Are you saying that there is change in magnetic flux through the plane as it travels? If so, why?

Steven Chase - 5 months, 3 weeks ago

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the wingtips are upright, so must cut magnetic line since which are from N to S

Hongqi Wang - 5 months, 3 weeks ago

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Yes, but for there to be an induced emf, the magnetic flux must be changing. And due to the uniformity of the magnetic field, there is no reason for the flux to change.

Steven Chase - 5 months, 3 weeks ago

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