A-LevelPhysicsMagnetic fieldsMay/June 2020Paper 4 Q910 Marks
An electron is travelling at speed v in a straight line in a vacuum. It enters a uniform magnetic field of flux density 8.0 × 10⁻⁴ T. Initially, the electron is travelling at right angles to the magnetic field, as illustrated in Fig. 9.1. The path of the electron in the magnetic field is an arc of a circle of radius 6.4 cm. A uniform electric field is now applied in the same region as the magnetic field. The electron passes undeviated through the region of the two fields, as illustrated in Fig. 9.2. [Figure 9.1] [Figure 9.2]
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