A11.3 m long steel beam is accidentally dropped by a construction crane from a height of 9.50 m. the horizontal component of the earth's magnetic field over the region is 18.5 μt. what is the induced emf in the beam just before impact with the earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the earth's magnetic field?

2.85 mV

Explanation:

L = 11.3 m

h = 9.5 m

B = 18.5 μ T = 18.5 x 10^-6 T

g = 9.8 m/s^2

u = 0

Let the velocity is v

v^2 = u^2 + 2 g h

v^2 = 2 x 9.8 x 9.5 = 186.2

v = 13.65 m/s

Motional emf, e = B v L = 18.5 x 10^-6 x 13.65 x 11.3 = 2.85 x 10^-3 V

e = 2.85 mV

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

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