(Electron charge e = 1.6 x 10-19 C) 56 Calculate the force experienced by an electron travelling through a B field of flux density 5 mT with velocity 500 ms-1. 57 An electron is accelerated through a pd of 500 V then passed into a region of magnetic field perpendicular to its motion causing it to travel in a circular path of radius 10cm. Calculate: (a) the KE of the electron in joules. (b) the velocity of the electron. V (c) the flux density of the magnetic field. 30 58 A proton (same charge as an electron but positive) passes into a B region of B field of flux density 5 mT as shown in Figure 6.92 with a velocity of 100 ms-1. Calculate the force experienced by the proton. Figure 6.92