An electron moves with constant velocity along the axis of a current-carrying straight solenoid. Which statements are correct? B: no magnetic force; C: it continues along the axis; other statements claim axial force/acceleration or parabolic motion.
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Question

An electron moves with constant velocity along the axis of a current-carrying straight solenoid. Which statements are correct? B: no magnetic force; C: it continues along the axis; other statements claim axial force/acceleration or parabolic motion.

Options

G1 Physics · Accepted Answer

Inside a long solenoid, B is along its axis. The electron velocity is parallel or antiparallel to B. Magnetic force F = q(v × B) = 0. Therefore it is not accelerated and continues with constant velocity along the axis. Statements B and C are correct.