Problem 75-5    Source:   Example 34-1 - RANDALL -    Book: Fundamentos de Física - 8ª Edição - Ed. LTC - 2009.

It is known that the Earth's magnetic field in northern Canada points straight down. The crew of a Boeing 747, flying at 260 m/s over this region of Canada, discovers that there is a potential difference of 0.95 V between the tips of the wings of your plane. The wingspan of a Boeing 747 is 65 m.

a) What is the strength of the magnetic field at the location?

Solution of the Problem 75-5   

Item a   

To solve this problem we will use eq. 75-02 which determines the voltage induced in a conductor when it travels a path where there is a magnetic field.

Então, fazendo um trabalho algébrico e substituindo as variáveis por seus respectivos valores, encontramos:

The Earth's magnetic field is approximately 5.0 x 10^-5   T. It's a little more intense than this value near the magnetic poles and a little weaker near the equator.