EASY
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IMPORTANT
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Two insulating plates are both uniformly charged in such a way that the potential difference between them is . (i.e., the plate is at a higher potential). The plates are separated by and can be treated as infinitely large. An electron is released from rest on the inner surface of the plate . What is its speed when it hits plate ?


(a)
(b)
(c)
(d)

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Important Questions on Current Electricity
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HARD
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i) Take current entering from and assume it to spread over a hemispherical surface in the block.
ii) Calculate field at distance from by using ohm's law , where is the current per unit area at .
iii) From the dependence of , obtain the potential at .
iv) Repeat (i), (ii) and (iii) for current leaving and superpose results for and .

For current entering at , the electric field at a distance from is

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