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Resistance:
Resistance is the opposition to the motion of electrons. This arises as a result of collision of moving electrons.
The unit of resistance is "ohm" represented by omega.
Some wire of cross-sectional area 1mm 2 has a resistance of 20 ?. Determine (a) the resistance of a wire of the same length and material if the cross-sectional area is 4mm 2 ,
stop watch + least count+ picture of stop watch
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