Yesterday, I was solving some problems of Electromagnetic Induction. Suddenly a thought struck my mind.
Earth has its own magnetic Field.If an aircraft of metallic body is flying in the air then across its wing a voltage must be induced by motional EMF. So, suppose if we connect a bulb across its wing (at extreme ends) will the bulb glow?
Generally, the wingspan of normal aircraft is 30m (but of Boeing 777 is 65m) and it normally travels with a speed of 700-800km/h or 225 m/s. The place where I live(New Delhi), vertical magnetic field component is approximately 50 microTesla. So, if we assume wing to a straight rod then EMF induced across wings must be
B.L.v =$ 50\times10^{-6}\times65\times225 $= 0.72 volts
Appreciable potential difference. Small pencil LEDs typically get lit by mercury cell at 1.35 volts. But the point where I am having confusion is that the Earth magnetic field varies with the place.
So Will the bulb glow considering we have a bulb which can glow on a potential difference of this order, that is bulb consuming very low power ??