4) A metal airplane flies horizontally at 200. m/s where the Earth\'s magnetic f

Question

4) A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field is vertical and is 45.0 T. If the wingspan is 25.0 meters: (a) what emf is induced across the wings? (b) what wingspan would produce 1.0 volt emf?

5) A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 , at what rate is power generated in the coil?

Explanation / Answer

here,

4)

horizontal speed , v = 200 m/s

earth magnetic feild , B = 45 uT = 4.5 * 10^-5 T

length , l = 25 m

a)

the emf induced , V = B * v * l

V = 4.5 * 10^-5 * 200 * 25 V

V = 0.23 V

b)

let the length of wingspan be l'

V = B * v * l'

1 = 4.5 * 10^-5 * 200 * l'

solving for l'

l' = 111 m

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