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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Critical Thinking

  • question_answer
    A point charge of 40 stat coulomb is placed 2 cm in front of an earthed metallic plane plate of large size. Then the force of attraction on the point charge is

    A)            100 dynes

    B)            160 dynes

    C)            1600 dynes                            

    D)            400 dynes

    Correct Answer: A

    Solution :

                  By the concept of electrical image, it is considered that an equal but opposite charge present on the other side of the plate at equal distance. Hence force                    \[F=\frac{40\times 40}{{{4}^{2}}}=100\,dynes\]


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