Question: In a Millikan type experiment, two horizontal charged plates are 2.5 cm apart. A latex sphere of 1.3 x 10-15 kg remains stationary between

In a Millikan type experiment, two horizontal charged plates are 2.5 cm apart. A latex sphere of 1.3 x 10-15 kg remains stationary between the plates when the potential difference between the plates is 400 V with the upper plate charged positive. +++++++++++ a. What is the type of charge on the sphere? b. What is the electric field intensity between the plates?

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