| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason: |
| (R). Mark the correct choice as: |
| Assertion (A): A point charge is lying at the centre of a cube of each side. The electric flux emanating from each surface of the cube is \[\frac{1}{6}\]th of total flux. |
| Reason (R): According to Gauss theorem, total electric flux through a closed surface enclosing a charge is equal to \[{}^{1}/{}_{{{\varepsilon }_{0}}}\]times the magnitude of the charge enclosed. |
A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: B
Solution :
(b) The electric flux through the cube,\[\phi =q/{{\varepsilon }_{0}}\]. A cube has six faces of equal area. Therefore, electric flux through each \[=\frac{1}{6}\phi =\frac{1}{6}\left( q/{{\varepsilon }_{0}} \right)\]
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