J & K CET Engineering
J and K - CET Engineering Solved Paper-2011
question_answer
A parallel plate capacitor has two square plates with equal and opposite charges. The surface charge densities on the plates are \[+\sigma \] and \[-\sigma \] respectively. In the region between the plates the magnitude of the electric field is
A) \[\frac{\sigma }{2{{\varepsilon }_{0}}}\]
B) \[\frac{\sigma }{{{\varepsilon }_{0}}}\]
C) zero
D) None of these
Correct Answer:
B
Solution :
The magnitude of the electric field \[E=\frac{1}{2{{\varepsilon }_{0}}}[\sigma (-\sigma )]\] \[E=\frac{2\sigma }{2{{\varepsilon }_{0}}}\] \[E=\frac{\sigma }{{{\varepsilon }_{0}}}\]