A charged particle, initially at rest at $\mathrm{O}$, When released follows atrajectory as shown. Such a trajectory is possible in the presence of

• Correct answer
  A

  Electric field of constant magnitude and varying direction
• B

  Magnetic field of constant magnitude and varying direction
• C

  Electric field of constant magnitude and constant direction
• D

  Electric and magnetic fields of constant magnitudes and constant directions which are parallel to each other

Hence, the correct answer is option: 'A'.