A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will

  • [AIPMT 1997]
  • A

    Get deflected vertically upwards

  • B

    Move in a circular orbit with its speed increased

  • C

    Move in a circular orbit with its speed unchanged

  • D

    Continue to move due east

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  • [IIT 2002]

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  • [JEE MAIN 2015]

A electron experiences a force $\left( {4.0\,\hat i + 3.0\,\hat j} \right)\times 10^{-13} N$ in a uniform magnetic field when its velocity is $2.5\,\hat k \times \,{10^7} ms^{-1}$. When the velocity is redirected and becomes $\left( {1.5\,\hat i - 2.0\,\hat j} \right) \times {10^7}$, the magnetic force of the electron is zero. The magnetic field $\vec B$ is :