Question

18. Resistance of a conductor is given as R= ρl/A
The symbols have their usual meanings. Select
correct option
(1) Expression is dimensionally inconsistent
(2) Expression is correct
(3) Expression cannot be derived using
dimensional analysis
(4) Both (2) & (3)

(Can someone please explain how I can find whether an expression is dimensionally inconsistent or not?)​

Answer 1

Answer:

Option (2)

Explanation:

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Answer 2

Answer:

OPTION (4)

Explanation:

According to principle of homogenity of dimensions, this expression is correct but it cannot be derived using dimensional analysis because it involves quantities other than the 7 fundamental quantities.

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