NCERT 2022 | विद्युत - L15 | Electricity | Class 10 विज्ञान | Hindi Medium | Ruchi Ma'am| 6 PM

A charged dust particle of radius 5 xx 10^(-7)m is located in a horizontal electric field having an intensity of 6.28 xx 10^(5) V m^(-1) . The surrounding medium in air with coefficient of viscosity eta = 1.6 xx 10^(-15) Ns m^(-2) . If this particle moves with a uniform horizontal speed of 0.01 ms^(-1), the number of electrons on it will be

A capacitor of capacitance C=15pF is charged with voltage V=500V . The electric field inside the capacitor with dielectric is 10^(6)V//m and the area of the plate 10^(-4)m^(2) , then the dielectric constant of the medium is : (._(epsilon0)=8.85xx10^(-12) in S.I units) (A) 12.47 (B) 8.47 (C) 10.85 (D) 14.85

The ionisation potential of mercury is 10.39 V. How far an electron must travel in an electric field of 1.5 xx 10^(6) V//m to gain sufficient energy to ionise mercury ?