Given, gravitational constant $=6.7 \times 10^{-11} \,Nm ^{-2} / kg ^2$
Mass of an electron $=9.1 \times 10^{-31} \,kg$
Charge of an electron $=1.6 \times 10^{-19} \,C$
Gravitational force, $F_G=\frac{G n_1 m_2}{r^2}$
$=\frac{6.7 \times 10^{-11} \times\left(9.1 \times 10^{-31}\right)^2}{r^2}$
Electrostatic repulsive force,
$F_E =\frac{K q_1 q_2}{r^2}$
$=\frac{9 \times 10^9 \times\left(1.6 \times 10^{-19}\right)^2}{r^2}$
$\therefore \frac{F_G}{F_E}=\frac{6.7 \times 10^{-11} \times\left(9.1 \times 10^{-31}\right)^2}{9 \times 10^9 \times\left(1.6 \times 10^{-19}\right)^2}$
$=24 \times 10^{-44}$
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$(1) $ energy density
$(2)$ refractive index
$(3) $ dielectric constant
$(4) $ Young's modulus
$(5)$ magnetic field
(given : $\mathrm{R}=$ Radius of bubble, $\mathrm{S}=$ Surface tension of bubble)
