Question

15. a) State Ohm's law. Express it mathematically and graphically.
b) Calculate the length of aluminium wire of area of cross-section 1mm2 whose
resistance is 2.56 x 10-2ohm. Given, resistivity of aluminium is 2.6 x 10-8ohm-m.
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Answer 1

Answer:

a) at const temp the potential difference is directly prop to current in a conductor

V=IR

$v \alpha r$