Electro Magnetic Induction And Alternating Currents Question 423
Question: Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth’s magnetic field is $ 0.2\times {{10}^{-4}}weber/m^{2} $ and the rails are separated by 1 metre [IIT 1981; KCET 2001]
Options:
A) $ {{10}^{-2}}volt $
B) $ {{10}^{-4}}volt $
C) $ {{10}^{-3}}volt $
D) 1 volt
Show Answer
Answer:
Correct Answer: C
Solution:
$ e=B_{v}.vl $ $ =0.2\times {{10}^{-4}}\times ( \frac{180\times 1000}{3600} )\times 1 $ $ ={{10}^{-3}}V $
