According to Gauss's law in electrostatics, the electric flux through a closed surface depends on:
1. | the area of the surface |
2. | the quantity of charges enclosed by the surface |
3. | the shape of the surface |
4. | the volume enclosed by the surface |
1. | Qε0×10−6 | 2. | 2Q3ε0×10−3 |
3. | Q6ε0×10−3 | 4. | Q6ε0×10−6 |
1. | the electric field inside the surface is necessarily uniform. |
2. | the number of flux lines entering the surface must be equal to the number of flux lines leaving it. |
3. | the magnitude of electric field on the surface is constant. |
4. | all the charges must necessarily be inside the surface. |
Twelve point charges each of charge q C are placed at the circumference of a circle of radius r m with equal angular spacing. If one of the charges is removed, the net electric field (in N/C) at the centre of the circle is:
(ε0-permittivity of free space)
1. | 13q4πε0r2 | 2. | zero |
3. | q4πε0r2 | 4. | 12q4πε0r2 |
1. | 1R6 | 2. | 1R2 |
3. | 1R3 | 4. | 1R4 |
List-I (Application of Gauss Law) |
List-II (Value of |E|) |
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A. | The field inside a thin shell | I. | λ2πε0rˆn |
B. | The field outside a thin shell | II. | q4πε0R2ˆr |
C. | The field of thin shell at the surface | III. | q4πε0r2ˆr |
D. | The field due to a long charged wire | IV. | zero |
1. | A-IV, B-III, C-I, D-II |
2. | A-I, B-II, C-III, D-IV |
3. | A-IV, B-III, C-II, D-I |
4. | A-I, B-III, C-II, D-IV |