For the given spherical Gaussian surface around and centred at infinite positive line charge, the angle between electric field →E and area vector →A, at all the point on the surface is
A
90∘
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B
equal but not 0∘ or 90∘
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C
not equal
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D
0∘
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Solution
The correct option is C not equal The electric field lines configuration of the infinite line charge and area vector →A at some points of the Gaussian suface is shown in figure.
From the figure, we can see that the angle between electric field →E and area vector →A at all points of the Gaussian surface is not equal.