The radius of the second Bohr orbit for hydrogen atom is:
(Planck’s Const. h = 6.6262 × 10⁻³⁴ Js; mass of electron = 9.1091 × 10⁻³¹ kg; charge of electron (e) = 1.60210 × 10⁻¹⁹ C; permittivity of vacuum () = 8.854185 × 10⁻¹² kg⁻¹ m⁻³ A²)
JEE Main 2017 · Session, Shift 1 · Q2113