The charge per unit length of the four quadrant of the ring is $2\ \lambda , - 2\ \lambda , \lambda$ and $- \lambda$ respectively. The electric field at the centre is
The charge per unit length of the four quadrant of the ring is $2\ \lambda , - 2\ \lambda , \lambda$ and $- \lambda$ respectively. The electric field at the centre is
- A
$-$ $\frac{\lambda }{{2\pi {\varepsilon _0}R}}\,\hat i$
- B
$\frac{\lambda }{{2\pi {\varepsilon _0}R}}\,\hat j$
- C
$\frac{{\sqrt 2 \,\,\lambda }}{{4\pi {\varepsilon _0}R}}\,\hat i$
- D
None
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