U & D again

JEE Main 2015 Papers › General Physics questions › U & D again

[ These qs r too easy I agree but there r some crunches in the ans given So i din't dare to take risk]

Which of the following functions of A & B is possibility correct if A & B possess diff dimensions?

(A) A/e^A/B

(B) B/log(A/B)

(D) B/e^A+B

#Physics #General Physics

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3 Answers

Lokesh Verma ·2009-12-23 10:47:12

c only....

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abcd ·2009-12-23 20:11:16

yes its C only

Reason:

e and log are dimensionless hence if u have e raised to something then that something shud be dimensionless similarly for log u cannot have dimension enclosed

as A and B have different dimensions:
hence
(A) is wrong as A/B will have some dimension
(B) again follow (A)
(D)you can not have '+' operator in the power to which e is raised until each individual entity is dimensionless

i hope u get it!!