20.3. Force on a moving charge
A subsection of Physics, 9702, through 20. Magnetic fields
Listing 10 of 105 questions
Negatively-charged particles are moving through a vacuum in a parallel beam. The particles have speed v. The particles enter a region of uniform magnetic field of flux density 930 μT. Initially, the particles are travelling at right-angles to the magnetic field. The path of a single particle is shown in . negatively-charged particles, speed v uniform magnetic field, flux density 930 μT arc of radius 7.9 cm The negatively-charged particles follow a curved path of radius 7.9 cm in the magnetic field. A uniform electric field is then applied in the same region as the magnetic field. For an electric field strength of 12 kV m–1, the particles are undeviated as they pass through the region of the fields. On , mark with an arrow the direction of the electric field. Calculate, for the negatively-charged particles, the speed v, v = m s–1 the ratio charge mass . ratio = C kg–1
9702_s10_qp_41
THEORY
2010
Paper 4, Variant 1
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Questions Discovered
105