Answer: Experiences minimum force of zero.
- A Experiences maximum force
- B Experiences minimum force of zero
- C Moves in circle
- D Accelerates in field direction
Correct answer: B. Experiences minimum force of zero
Explanation: F = qvB sin(theta). When v is parallel to B, theta=0, sin(0)=0. Force = 0.
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.