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## Homework Statement

This question and the next two refer to this situation:

http://i.imgur.com/dgJMR.png

A passenger jet is flying over Alaska in level flight at a constant altitude h = 10 km and constant speed of v = 300 m/s, immersed in the Earth's vertically downward-pointing magnetic field of B = 30 μT. The distance between the tips of the aircraft's metal wings is d = 50 m.

**Part A:**

Calculate the potential difference ε between the aircraft's wing tips due its motion through the Earth's magnetic field.

(a) ε = 0.0 volts

(b) ε = 0.45 volts

(c) ε = 0.90 volts

Answer is B

**Part B**

Which wingtip has positive charge, as viewed by a passenger in the airplane who is facing in the direction that the airplane is traveling?

(a) the right wingtip

(b) the left wingtip

(c) neither wingtip

Answer is B

## Homework Equations

emf = d flux / dt

flux = int[B*dA]

## The Attempt at a Solution

For part A, I tried formula above, I get answer C, because I thought I need to calculate difference for both wings? Part B I used F=BIL, however, I get the force is on right wing? What is the relationship between force ans its direction of the plane that traveling?

Thx