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A satellite, orbiting the earth at the equator at an altitude of 400 km, has an antenna that can be modeled as a 1.76-m-long rod. The antenna is oriented perpendicular to the earth's surface. At the equator the earth's magnetic field is essentially horizontal and has a value of 8.0×10−5T; ignore any changes in B with altitude.
Assuming the orbit is circular, determine the induced emf between the tips of the antenna.

Respuesta :

Answer:

The inducerd emf is 1.08 V

Solution:

As per the question:

Altitude of the satellite, H = 400 km

Length of the antenna, l = 1.76 m

Magnetic field, B = [tex]8.0\times 10^{- 5}\ T[/tex]

Now,

When a conducting rod moves in a uniform magnetic field linearly with velocity, v, then the potential difference due to its motion is given by:

[tex]e = - l(vec{v}\times \vec{B})[/tex]

Here, velocity v is perpendicular to the rod

Thus

e = lvB           (1)

For the orbital velocity of the satellite at an altitude, H:

[tex]v = \sqrt{\frac{Gm_{E}}{R_{E}} + H}[/tex]

where

G = Gravitational constant

[tex]m_{e} = 5.972\times 10^{24}\ kg[/tex] = mass of earth

[tex]R_{E} = 6371\ km[/tex] = radius of earth

[tex]v = \sqrt{\frac{6.67\times 10^{- 11}\times 5.972\times 10^{24}}{6371\times 1000 + 400\times 1000} = 7670.018\ m/s[/tex]

Using this value value in eqn (1):

[tex]e = 1.76\times 7670.018\times 8.0\times 10^{- 5} = 1.08\ V[/tex]

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