Internet search company Google operates a fleet of cars known as “Google Street

Question

Internet search company Google operates a fleet of cars known as “Google Street View car”. Cars are equipped with 3 ft tall metal stand for the camera. At some point, the car is traveling at 80 km/hr on the road where the earth’s magnetic field is approximately 4.5 x 10^-5 T. Why the movement of the car produces the potential difference between two ends of the metal stand. Which principle encapsulates the phenomenon. How large is the voltage induced between the roof of the car and the camera stand?

Explanation / Answer

it is govern by Faraday's law of electromagnetic induction

it state -“that a voltage is induced in a circuit whenever relative motion exists between a conductor and a magnetic field and that the magnitude of this voltage is proportional to the rate of change of the flux”.

E= -BLV

- ve sign show that direction of an induced emf is such that it will always opposes the change that is causing it

E=4.5*10-5*9.8425*80*5/18=984.25*10-5V=0.98425mV

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