Answer: 1 : 1.
- A 1 : 1
- B 1 : 2
- C 2 : 1
- D 1 : √2
Correct answer: A. 1 : 1
Explanation: r = p/(qB). Both have the same momentum p and the same charge q in the same field B, so the radii are equal, 1 : 1.
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.