એક સમઘન કદ \(x=0, x= a , y=0, y= a\) અને \(z=0, z= a\) સપાટીઓ દ્વારા ઘેરાયેલ છે. આ વિસ્તારમાં વિદ્યુતક્ષેત્ર \(\overrightarrow{ E }={E_{ox}} \hat{i},\) જ્યાં \(E _0=4 \times 10^4\,NC ^{-1}\,m ^{-1}\), વડે આપવામાં આવે છે. જો \(a=2\,cm\) હોય તો સમઘન કદમાં સંકળાયેલ વિદ્યુતભાર \(Q \times 10^{-14}\,C\) છે. \(Q\) નું મૂલ્ય \(........\) થશે.( \(\varepsilon_0= 9 \times 10^{-12}\,C ^2 / Nm ^2\) લો.)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.