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AMU Medical AMU Solved Paper-2009

  • question_answer
    An electron is moving on a circle of radius 0.5 A with a frequency .of \[\text{5}\times \text{1}{{0}^{\text{16}}}\] Hz in anti-clockwise direction.  The  equivalent loop-current is

    A)  4.0 mA (clockwise)

    B)  4.0 mA (anti-clockwise)

    C)  8.0 mA (clockwise)

    D)  8.0 mA (anti-clockwise)

    Correct Answer: C

    Solution :

                     The time rate of flow of charge through any cross-section is called current.                                 \[l=\frac{q}{t}=qv\] Here,     q = e \[\therefore \]  \[l=ev=1.6\times {{10}^{-19}}\times 5\times {{10}^{16}}\]                 = 8 mA The direction of the current is opposite to the motion of electron ie clockwise.


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