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TASPhysicsQuick questions
Unit 3: Gravity and Electromagnetism
Quick questions on Charged particles in magnetic fields - TCE Physics (Tasmania)
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the magnetic force as a centripetal force?Show answer
The force on a charge moving at speed through a field is , maximum when the velocity is perpendicular to the field. This force is always perpendicular to the velocity, so it never speeds the charge up or slows it down; it only changes the direction. A force of constant size always perpendicular to the motion is exactly what produces uniform circular motion.
What is the period is independent of speed?Show answer
Substituting into the radius equation and simplifying gives the period:
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