Physics - Current Electricity Question with Solution | TestHub
Paragraph:Consider a block of conducting material of resistivity ' ' shown in the figure. Current 'l' enters at 'A' and leaves from ' '. We apply superposition principle to find voltage ' ' developed between ' ' and ' '. The calculation is done in the following steps:
(i) Take current 'l' entering from 'A' 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 'l' leaving ' ' and superpose results for ' ' and ' '.
Question:For current entering at , the electric field at a distance ' ' from is
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