A dust particle of mass 4.1 mg and charge +2.5 pC is released form rest 12 cm

Question

A dust particle of mass 4.1 mg and charge +2.5 pC is released form rest 12 cm from a fixed charge of 4.2 mC. What will the dust particle's initial acceleration be when released?

Answer 1

a = F/m = k_eQ₁Q₂/d²

a = 8.99 x 10⁹(2.5 x 10^-12C)(4.2 x 10^-3C)/((4.1 x 10^-6 kg)(.12 m)²)

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