# Explaining motional emf in terms of the hall effect?

1. Jun 4, 2007

### ice109

im thinking of the classic airplane problem. the one where the flying airplane develops a voltage across its wingspan. now this was posed to me as a motional emf problem and i bought it then but simultaneously thought that it seemed like a hall effect problem.

so two questions

now that i think back. how is this a motional emf problem?there's no current loop? the only way i could see it as that if you thought of the wingspan as an antenna that developed a voltage across simply because of E field that is concomitant to the earth's B field. but how is there a $$\frac{d\phi}{dt}$$?

and
how can i solve a problem like this as a hall effect problem?

i can't find one right now but any random numbers would do

airplane flying 30m/s and having a 30m wingspan.

edit

this is not a hw problem, the numbers are simply to serve as an example

Last edited: Jun 4, 2007
2. Jun 5, 2007

### ice109

anyone anyone?