Answer: cyclotron.
- A cyclotron
- B natural sound
- C resonant acoustic
- D angular displacement
Correct answer: A. cyclotron
Explanation: The applied frequency matches the cyclotron frequency qB/2πm so the particle is accelerated each half-cycle.
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.