Answer: larger than.
- A larger than
- B smaller than
- C equal to
- D negligible beside
Correct answer: A. larger than
Explanation: Since r = mv/qB and the proton is far more massive, its radius is larger.
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.