Electro Magnetic Induction And Alternating Currents Question 496

Question: A horizontal straight wire 20m long extending from 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

Options:

A) 3 mV

B) 4.5 mV

C) 1.5mV

D) 6.0 mV

Show Answer

Answer:

Correct Answer: A

Solution:

  • $ {\varepsilon_{ind}}=Bv\ell =0.3\times {{10}^{-4}}\times 5\times 20 $

    $ =3\times {{10}^{-3}},V=3m,V $ .



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