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JEE Main & Advanced Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank Self Evaluation Test - Moving Charges and Mangetism

  • question_answer
    A long straight wire carries a certain current and produces a magnetic field of \[2\times {{10}^{-4}}\frac{weber}{{{m}^{2}}}\]at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire moves with a velocity \[{{10}^{7}}\,m/s\] towards the wire along perpendicular to it. The force experienced by the electron will be (charge on electron\[=1.6\times {{10}^{-19}}N\])

    A) Zero

    B) \[3.2\,N\]

    C) \[3.2\,\times {{10}^{-16}}N\]

    D) \[1.6\,\times {{10}^{-16}}N\]

    Correct Answer: C

    Solution :

    [c] Given: Magnetic field B\[=2\times {{10}^{-4}}\,weber/{{m}^{2}}\] Velocity of electron, \[v={{10}^{7}}\,m/s\] Lorentz force \[F=qvB\,\sin \,\theta \] \[=1.6\times {{10}^{-19}}\times {{10}^{7}}\times 2\times {{10}^{-4}}\]     \[\left( \because \,\,\theta ={{90}^{o}} \right)\] \[=3.2\times {{10}^{-16}}N\]


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