1.

Which of the following is NOT dimensionless?20 Magnifying power(B) Relative displacement(C) Relative refractive Index(D) Dielectric constant.6.

Answer»

Dielectric constant isrelative permittivity ,( K=er =e/eo).

Here, e and eo are permittivities of the medium and vacuum.

Also, K=C/Co, where C is capacitance in the presence of dielectric and Co is capacitance when there is vacuum( practically air) between two ' plates' of capacitor.

Thus, dielectric constant is ratio of same quantities it is dimensionless number.

Both b and c are ratios of the same physical quantity. Hence they are also dimensio less.

hence, option (A) is correct



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