A10 m long steel beam is accidentally dropped by a construction crane from a height of 4.89 m. the horizontal component of the earth’s magnetic field over the region is 12.4 µt. the acceleration of gravity is 9.8 m/s 2 . what is the induced emf in the beam just before impact with the earth, assum

e = 1.21 mV

Explanation:

given,                                

length of rod = 10 m                

height of drop = 4.89 m          

Earth’s magnetic field =  12.4 µT

acceleration of gravity = 9.8 m/s²

velocity of the beam                      

v = 9.79 m/s                        

emf of the beam

e = B l v                              

e = 12.4 x 10⁻⁶ x 9.79 x 10

e = 1.21 x 10⁻³ V

e = 1.21 mV

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5