Answer: Circle.
- A Straight line
- B Parabola
- C Circle
- D Ellipse
Correct answer: C. Circle
Explanation: A charged particle moving perpendicular to a uniform magnetic field moves in a circle. The magnetic force provides centripetal force.
The magnetic field around a long straight current-carrying wire forms concentric circles, with direction given by the right-hand rule (point thumb along I, fingers curl in the direction of B).
Concept context
Magnetic force on moving charges and currents, the Biot-Savart law, Ampere's law, and the cyclotron - how electric currents create and respond to magnetic fields.