20.3a Ex3 MJ19 P42 Q8 Particle Helical Path | A2 Magnetic Fields | CAIE A Level 9702 Physics

Advanced example 3 - 9702/42/M/J/19: An electron is travelling in a vacuum at a speed of 3.4 × 10^7 m s–1. The electron enters a region of uniform magnetic field of flux density 3.2 mT, as illustrated in Fig. 8.1. The initial direction of the electron is at an angle of 30° to the direction of the magnetic field.
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(a) When the electron enters the magnetic field, the component of its velocity vN normal to the direction of the magnetic field causes the electron to begin to follow a circular path

(b) State the magnitude of the force, if any, on the electron in the magnetic field due to the component of its velocity along the direction of the field

(c) Use information from (a) and (b) to describe the resultant path of the electron in the magnetic field. (it's a helical / coil path!)

SIMULATION:
Circular Motion & Helix 3D (https://www.geogebra.org/m/qajRP2O4)

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