question_answer

A horizontal straight wire 20 m long extanding from to east to west falling with a speed of 5.0 M\s, at right angles to the horizontal component of the earth's magnetic field \[0.30\times {{10}^{-4}}Wb/{{m}^{2}}.\]The instantaneous Value of the e.m. f. induced in the wire will be :     AIEEE  Solved  Paper (Held On 11 May  2011)

A)  3 mV           

B)  4.5 mV          

C)  1.5 mV          

D)  6.0m V

Correct Answer: A

Solution :

                                     \[{{\varepsilon }_{Ind}}=Bv\ell \] \[=0.3\times {{10}^{-4}}\times 5\times 20\] \[=3\times {{10}^{-3}}v\] \[=3mv.\]