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)

(ok so I know the answer is (2) but how do I know when an expression is dimensionally inconsistent?)​

Answer 1

Answer:

option (4)

Explanation:

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

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