A charged wire is bent in the form of a semi-circular arc of radius a. If charge per unit length is \[\lambda \] coulomb/metre, the electric field at the centre O is:

\[\frac{\lambda }{2\pi {{a}^{2}}{{\varepsilon }_{0}}}\]

\[\frac{\lambda }{4{{\pi }^{2}}{{\varepsilon }_{0}}a}\]

\[\frac{\lambda }{2{{\pi }^{2}}{{\varepsilon }_{0}}a}\]

A charged wire is bent in the form of a semi-circular arc of radius a.

1.	A charged wire is bent in the form of a semi-circular arc of radius a. If charge per unit length is \[\lambda \] coulomb/metre, the electric field at the centre O is:
A.	\[\frac{\lambda }{2\pi {{a}^{2}}{{\varepsilon }_{0}}}\]
B.	\[\frac{\lambda }{4{{\pi }^{2}}{{\varepsilon }_{0}}a}\]
C.	\[\frac{\lambda }{2{{\pi }^{2}}{{\varepsilon }_{0}}a}\]
D.	zero
Answer» D. zero