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Question: A small element l is cut form a circular ring of radius 'a' and l charge per unit length. The net el...

A small element l is cut form a circular ring of radius 'a' and l charge per unit length. The net electric field at the centre of ring is -

A

Zero

B

λl4π∈0a2\frac{\lambda\mathcal{l}}{4\pi \in_{0}a^{2}}

C

Infinity

D

λ4π∈0l\frac{\lambda}{4\pi \in_{0}\mathcal{l}}

Answer

λl4π∈0a2\frac{\lambda\mathcal{l}}{4\pi \in_{0}a^{2}}

Explanation

Solution

Net electric field at centre of ring = E field due to small elements l at centre = 14π∈0\frac { 1 } { 4 \pi \in _ { 0 } }