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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    A conductor of length 20 cm carries a current of 1 A is kept at an angle with the magnetic field of 4 T. Find the angle between the conductor and the magnetic field if it experiences a force of 0.4 N.

    A) \[0{}^\circ \]                            

    B) \[30{}^\circ \]

    C) \[60{}^\circ \]                          

    D) \[90{}^\circ \]

    Correct Answer: B

    Solution :

    (b) \[30{}^\circ \]                         \[F=IlB\,\sin \theta \]             Or         \[\sin \theta =\frac{F}{IlB}=\frac{0.4}{1\times \frac{20}{100}\times 4}=\frac{1}{2}\]                         \[\Rightarrow \theta =30{}^\circ \]


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