F = q E = 1.6 * 10-19 * 20800 = 3.33 * 10-15 N
FE in -y direction , FE = -3.33 * 10-15 N
FB = q v B sin theta
= 1.6 * 10-19 * 2.6 * 104 * 0.80 * sin 90
= 3.33 * 10-15 N
Ftotal = FB + FE
= 3.33 * 10-15 N + [- 3.33 * 10-15 N]
= -7.0 * 10-15 N
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