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URGENT HELP : PHYSICS A2 QUESION

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Hey,
Can anyone help me with this questions urgently about the millikan's oil drop experiment

1) In the millikan's oil drop experiment, a charged oil drop of mass 4x10^-15 kg is held stationary when an electric field is applied between two horizontal plates. If the drop carries 6 electric charges, each of value 1.6x10^-19 C, find the value of the electric field strength.

2) When an electric field of strength , E1 is applied btn 2 horizontal plates, a charged droplet moves upwards with terminal velocity , V1. When the direction of this field is reversed, the terminal velocity is v2 downwards. The droplet can be held stationary by a field of strength E2. express the ratio of v1 to v2 in terms of e1 and e2
 
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