JEE (Advanced) 2016 Paper-1 Question 10

Question 10

A length-scale (J) depends on the permittivity ($$ε$$) of a dielectric material, Boltzmann constant ($$k_B$$), the absolute temperature (T), the number per unit volume (n) of certain charged particles, and the charge (q) carried by each of the particles. Which of the following expression(s) for l is(are) dimensionally correct?

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