SATHEE: Electro Magnetic Induction And Alternating Currents Question 423

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 $0.2 \times 10^{- 4} w e b e r / m^{2}$ and the rails are separated by 1 metre [IIT 1981; KCET 2001]

Options:

A) $10^{- 2} v o l t$

B) $10^{- 4} v o l t$

C) $10^{- 3} v o l t$

D) 1 volt

Show Answer

Answer:

Correct Answer: C

Solution:

$e = B_{v} . v l$ $= 0.2 \times 10^{- 4} \times (\frac{180 \times 1000}{3600}) \times 1$ $= 10^{- 3} V$

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Electro Magnetic Induction And Alternating Currents Question 423

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