Q. No.Two charges 2 and 8 are separated by 6 cm. The neutral point is at:
1.
4 cm from 2 μC.
2.
2 cm from 2 μC .
3.
2 cm from 8 μC .
4.
3 cm from 8 μC .
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The ratio of the electric flux linked with shell \(A\) and shell \(B\) in the diagram shown below is:
| 1. | \(1: 1\) | 2. | \(1: 2\) |
| 3. | \(1: 4\) | 4. | \(4: 2\) |
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An electric dipole is kept at the origin as shown in the diagram. The point A, B, C are on a circular arc with the centre of curvature at the origin. If the electric fields at A, B and C respectively are , then which of the following is incorrect? \(\left ( d\gg l \right )\)
1.
2.
3.
4.
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A large non-conducting sheet S is given a uniform charge density. Two uncharged small, metal rods A and B are placed near the sheet as shown in the following diagram. Choose the incorrect option:
1. S attracts A.
2. S attracts B.
3. A attracts B.
4. S repels A.
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An electric dipole is placed at the centre of a sphere. Which of the following statements is correct?
| 1. | The electric flux through the sphere is zero. |
| 2. | The electric field is zero at every point on the sphere. |
| 3. | The electric field is zero at every point inside the sphere. |
| 4. | The electric field is uniform inside the sphere. |
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The electric flux from a cube of edge l is . What will be its value if the edge of the cube is made 2l and the charge enclosed is halved?
1.
2. 2
3. 4
4.
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A charged particle q of mass m is released on the y-axis at y = a in an electric field . The speed of particle on reaching the origin will be:
1.
2.
3.
4.
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A point charge q is placed at the center of the open face of a hemispherical surface as shown in the figure. The flux linked with the surface is:
1. zero
2.
3.
4.
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Four charges are arranged at the corners of a square ABCD as shown in the figure. The force on a positive charge kept at the center of the square is:
| 1. | Zero |
| 2. | Along diagonal AC |
| 3. | Along diagonal BD |
| 4. | Perpendicular to the side AB |
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A point charge is placed at the center of the spherical Gaussian surface. The electric flux through the surface is changed if the:
| 1. | sphere is replaced by a cube of the same volume. |
| 2. | sphere is replaced by a cube of half volume. |
| 3. | charge is moved off-centre in the original sphere. |
| 4. | charge is moved just outside the original sphere. |
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