NEET-XII-Physics
neet 2020 questions with solutions year:2020
- #31The capacitance of a parallel plate capacitor with air as medium is `` 6\, \mu F `` . With the introduction of a dielectric medium, the capacitance becomes 30 `` \mu F. `` The permittivity of the medium is :
`` (\epsilon_0 = 8.85 \times 10^{-12} C^2N^{-1}m^{-2} `` )
(A) `` 0.44 \times 10^{-13} C^2 N^{-1}m^{-2} ``
(B) `` 1.77 \times 10^{-12} C^2 N^{-1}m^{-2} ``
(C) `` 0.44 \times 10^{-10} C^2 N^{-1}m^{-2} ``
(D) `` 5.00 \,C^2 N^{-1}m^{-2} ``
digAnsr: AAns : `` C=KC_{0} ``
`` K=\frac{C}{C_{0}} ``
`` =\frac{30}{6}=5 ``
`` K=\frac{\varepsilon}{\varepsilon_{0}} ``
`` \varepsilon=K\,\varepsilon_{0} ``
`` =5 \times 8.85\times 10^{-12} ``
`` =0.44 \times 10^{-10}\,C^{2}\,N^{-1}\,m^{-2} ``