| A square surface of side L metre in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same place at an angle \[\theta \] with the horizontal side of the square as shown in figure. The electric flux linked to the surface in unit of \[V-m\], is [AIPMT (S) 2010] |
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A) \[E{{L}^{2}}\]
B) \[E{{L}^{2}}\cos \,\theta \]
C) \[E{{L}^{2}}\sin \,\theta \]
D) 0
Correct Answer: D
Solution :
[d] Flux of electric field \[\overset{\to }{\mathop{\mathbf{E}}}\,\] through any area \[{\AA}\] is defined as \[\phi =E\cdot A\cos \theta \] or \[\phi =\overset{\to }{\mathop{\mathbf{E}}}\,\cdot \overset{\to }{\mathop{\mathbf{A}}}\,=0\] the lines are parallel to the surface.
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