$264178$

$25.$ A very long uniformly charged wire having linear charge density $$ is arranged along the axis of a ring of radius $r.$ If a charge $\text{'}q\text{'}$ given to ring gets distributed uniformly on it then increase in tension of the ring is

zero

$\frac{}{4{}_0}\frac{q}{r^2}$

$\frac{}{2{}_0^2}\frac{q}{r}$

$\frac{}{2{}_0^2}\frac{q}{r}$