1. An electron travels at right angles to a magnetic fi eld of fl ux density 1.6 T, with a velocity of 2 × 105 m s–1. Calculate the force on the particle.
2. A charge of 5 C moves at 150 m s–1 perpendicular to a magnetic fi eld of fl ux density 2 T. Calculate the magnetic force on the charge.
3. A proton enters a uniform magnetic fi eld of fl ux density 4 T with a velocity of 3 × 104 m s–1. Calculate the radius of path it travels in the magnetic fi eld. (mass of proton = 1.673 × 10–27 kg)
4. If two particles enter a magnetic fi eld as shown, determine the direction of path each will take.
p+
5. If an ion of charge equal to +2 electrons enters a magnetic fi eld of fl ux density 2.4 T, with a velocity of 4 × 105 m s–1, perpendicular to the magnetic fi eld, calculate the force exerted on the ion.
6. A particle of mass equal to +3 protons enters a uniform magnetic fi eld of fl ux density 1 mT, with a velocity of 500 m s–1. Calculate:
(i) the force on the charge
(ii) the centripetal acceleration on the particle
(iii) the radius which the particle takes.
7. An electron beam is bent in a circle of radius 4 cm by a uniform magnetic fi eld of fl ux density 5 mT. Calculate the speed of the electron.
