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MCQMediumJEE Main 2025 · 28 January, Shift 1Electric Potential & Potential Energy

Physics Question from JEE Main 2025 · 28 January, Shift 1

A particle of mass mm and charge qq is fastened to one end AA of a massless string having equilibrium length ll, whose other end is fixed at point OO. The whole system is placed on a frictionless horizontal plane and is initially at rest. If a uniform electric field is switched on along the direction as shown in the figure, then the speed of the particle when it crosses the xx-axis is:

Coordinate axes with origin O, electric field directed along positive x-axis, and a string OA of length l initially making 60 degrees with the x-axis, with particle at A.
  • A

    qElm\sqrt{\frac{qEl}{m}}

  • B

    2qElm\sqrt{\frac{2qEl}{m}}

  • C

    qEl4m\sqrt{\frac{qEl}{4m}}

  • D

    qEl2m\frac{qEl}{2m}

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