Question

# Rajat, Sarath and Komal decided to measure resistance of aluminium and took bars of aluminium separately and measured its resistance in same room but got different values of resistance, of same material aluminium. What can be the probable reasons for these variations in resistance for same material?

A
they took bars of same length but different cross section area
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B
they took bars of same cross section area but different length.
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C
both length and cross section area of bars were different
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D
All of the above
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Solution

## The correct option is D All of the aboveThe equation representing the dependency of the resistance (R) of a conductor (e.g., a wire) upon the variables that affect it is R=pLA where L represents the length of the wire (in meters), A represents the cross-sectional area of the wire (in meters2), and (p) represents the resistivity of the material (in ohm•meter Basically if the material is same means resistivity (p) is same for both rods, other factors which influence the values of resistance is length and cross sectional area. Therefore all the above.

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