A horizontal straight wire 20 m long extending from east to west is falling with a speed of

Question:

A horizontal straight wire $20 \mathrm{~m}$ long extending from east to west is falling with a speed of $5.0 \mathrm{~m} / \mathrm{s}$, at right angles to the horizontal component of the earth's magnetic field $0.30 \times 10^{-4} \mathrm{~Wb} / \mathrm{m}^{2}$. The instantaneous value of the e.m.f. induced in the wire will be :-

  1. $6.0 \mathrm{mV}$

  2. $3 \mathrm{mV}$

  3. $4.5 \mathrm{mV}$

  4.  $1.5 \mathrm{mV}$


Correct Option: , 2

Solution:

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