at 2.304×10⁹m the electric field magnitude equal to 2.50 nc.
electric field due to a long uniformly charged wire is given as,
E= 2kλ/r
where,
k is a constant
λ is uniform charge density
r is the distance from the wire
λ = 3.20 × 10⁻¹⁰C/m
k= 9×10⁹
therefore r = 2kλ/E
on substituting value we get,
r= 2.304×10⁹m
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