Question

Q8] A helium nucleus carriers a charge of \( +2 e \) where \( e \) is the elementary charge. Find the electric potential at \( 10^{-10} \) from the helium nucleus \( \left[ e =1.6 \times 10^{-19} c , \frac{1}{4 \pi \epsilon}=9 \times 10^{9} Nm ^{2} / c ^{2}\right] \).

Answer 1

We know that electric potential V \(=\frac1{4\pi\varepsilon_0}\frac qr\)

V = kq/r

∵ k = 1/4 πɛ₀ = 9 x 10⁹

Electric potential \(=\frac{9\times10^9\times2\times1.6\times10^{-19}}{1\times10^{-10}}\)  

= 28.8 x 10^-10+10

V = 28.8 volt