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12th Class Physics Electric Charges and Fields Question Bank Case Based (MCQs) - Electric Charges and Fields

  • question_answer
    A particle of mass m carrying charge q is kept at rest in a uniform electric field E and then released. The kinetic energy gained by the particle, when it moves through a distance y is:

    A) \[\frac{1}{2}qE{{y}^{2}}\]                 

    B) \[qEy\]

    C) \[qE{{y}^{2}}\]                      

    D) \[q{{E}^{2}}y\]

    Correct Answer: B

    Solution :

    (b) \[qEy\] Here, \[u=0;\,a=\frac{qE}{m};\,s=y\] Using, \[{{v}^{2}}-{{u}^{2}}=2as\Rightarrow {{v}^{2}}=2\frac{qE}{m}y\] \[\therefore \,\,\,K.E.=\frac{1}{2}m{{v}^{2}}=qEy\]


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