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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Motional EMI

  • question_answer
    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]

    A)            \[{{10}^{-2}}volt\]              

    B)            \[{{10}^{-4}}volt\]

    C)            \[{{10}^{-3}}volt\]              

    D)            1 volt

    Correct Answer: C

    Solution :

               \[e={{B}_{v}}.vl\]\[=0.2\times {{10}^{-4}}\times \left( \frac{180\times 1000}{3600} \right)\times 1\]\[={{10}^{-3}}V\]


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