20.3b Ex2 FM16 P42 Q9 Particle Analysis | A2 Magnetic Fields | CAIE A Level 9702 Physics

9702/42/F/M/16: A particle of charge +q and mass m is travelling with a constant speed of 1.6 × 10^5 m s–1 in a vacuum. The particle enters a uniform magnetic field of flux density 9.7 × 10^–2 T, as shown in Fig. 9.1.

The magnetic field direction is perpendicular to the initial velocity of the particle and perpendicular to, and out of, the plane of the paper. A uniform electric field is applied in the same region as the magnetic field so that the particle passes undeviated through the fields.

(a) State and explain the direction of the electric field.
(b) Calculate the magnitude of the electric field strength. Explain your working.
(c) The electric field is now removed so that the positively-charged particle follows a curved path in the magnetic field. This path is an arc of a circle of radius 4.0 cm. Calculate, for the particle, the ratio q/m

(d) The particle has a charge of 3e where e is the elementary charge.
(i) Use your answer in (c) to determine the mass, in u, of the particle
(ii) The particle is the nucleus of an atom. State the number of protons and the number of
neutrons in this nucleus.
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