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12th Class Physics Magnetism Question Bank Case Based (MCQs) - Moving Charges and Magnetism

  • question_answer
        A charge q moves with a velocity \[2\text{ }m{{s}^{-1}}\] along X-axis in a uniform magnetic field\[\overrightarrow{B}=(\widehat{i}+2\widehat{j}+3\widehat{k})T\], then charge will experience a force:

    A) in ZY-plane                   

    B) along -Y axis            

    C)      along + Z axis               

    D) along-Z axis                

    Correct Answer: A

    Solution :

    (a) in ZY-plane \[\overrightarrow{F}=q(\overrightarrow{v}\times \overrightarrow{B})\] \[=q[2\widehat{i}\times (\widehat{i}+2\widehat{j}+3\widehat{k})]=(4q)\widehat{k}-(6q)\widehat{j}\]


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