Answer: 2000 m/s.
- A 250 m/s
- B 500 m/s
- C 2000 m/s
- D 2×10⁶ m/s
Correct answer: C. 2000 m/s
Explanation: v = E/B = 1000/0.5 = 2000 m/s.
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.