given,
magnetic field = 1.98 mT
time interval = pi * mass of electron / charge of electron * magnetic field
time interval = pi * 9.109 * 10^-31 / (1.6 * 10^-19 * 1.98 * 10^-3)
time interval = 9.03307054 * 10^-9 sec
r = 1.97 cm
r = mv / qB
0.0197 = 9.109 * 10^-31 * v / (1.6 * 10^-19 * 1.98 * 10^-3)
v = 6.851 * 10^6 m/s
kinetic energy = 0.5 * mv^2
kinetic energy = 0.5 * 9.109 * 10^-31 * (6.851 * 10^6)^2
kinetic energy = 2.1377 × 10^-17 J
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