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 $ .
