Question

Find the potential at the centre of a uniformly charged semi-circular wire with uniform linear charge density of 4 nC/m. 

(1) 36 \(\pi\) volts

(2) 29 \(\pi\) volts

(3) 9 \(\pi\) volts

(4) Zero volts

Answer 1

Correct Option is (1) 36 \(\pi\) volts 

v = \(\frac{kQ}{R}\) 

= \(\frac{9\times10^9(\pi{R})\times4\times10^{-9}}{R}\) 

= \(36\pi\) volt