Question 495: Electrostats & Capacitance

Question

What will be the magnitude of electric field at point O as shown in the figure? Each side of the figure is l and perpendicular to each other?

Accepted Answer

$${E_1} = {{kq} \over {{l^2}}} = {E_2}$$
$${E_3} = {{kq} \over {{{(\sqrt 2 l)}^2}}} = {{kq} \over {2{l^2}}}$$
$$E = {{\sqrt 2 kq} \over {{l^2}}} - {{kq} \over {2{l^2}}} = {{kq} \over {2{l^2}}}\left( {2\sqrt 2  - 1} \right)$$

Answer

$${1 \over {4\pi {\varepsilon _0}}}{q \over {{l^2}}}$$

Answer

$${1 \over {4\pi {\varepsilon _0}}}{q \over {(2{l^2})}}\left( {2\sqrt 2  - 1} \right)$$

Answer

$${q \over {4\pi {\varepsilon _0}{{(2l)}^2}}}$$

Answer

$${1 \over {4\pi {\varepsilon _0}}}{{2q} \over {2{l^2}}}\left( {\sqrt 2 } \right)$$

Electrostats & Capacitance

What will be the magnitude of electric field at point O as shown in the figure? Each side of the figure is l and perpendicular to each other?

Choose the correct answer: