- 1(current)
Q. No.The electric flux through the surface:
| 1. | in figure-(iv) is the largest |
| 2. | in figure-(iii) is the least |
| 3. | in figure-(ii) is same as figure-(iii) but is smaller than figure-(iv) |
| 4. | is the same for all the figures |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFive charges \(q_1, q_2, q_3, q_4~\text{and}~q_5\) are fixed at their positions as shown in the figure, \(S\) is a Gaussian surface. The Gauss' law is given by \(\int_{S}E\cdot dS= \frac{q}{\varepsilon_0}\). Which of the following statements is correct?
| 1. | \(E\) on the LHS of the above equation will have contribution from \(q_1, q_5~\text{and}~q_3\) while \(q\) on the RHS will have a contribution from \(q_2~\text{and}~q_4\) only. |
| 2. | \(E\) on the LHS of the above equation will have a contribution from all charges while \(q\) on the RHS will have a contribution from \(q_2~\text{and}~q_4\) only. |
| 3. | \(E\) on the LHS of the above equation will have a contribution from all charges while \(q\) on the RHS will have a contribution from \(q_1, q_3~\text{and}~q_5\) only. |
| 4. | Both \(E\) on the LHS and \(q\) on the RHS will have contributions from \(q_2\) and \(q_4\) only. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf \(\int_S E.ds = 0\) over a surface, then:
| (a) | the electric field inside the surface and on it is zero. |
| (b) | the electric field inside the surface is necessarily uniform. |
| (c) | the number of flux lines entering the surface must be equal to the number of flux lines leaving it. |
| (d) | all charges must necessarily be outside the surface. |
Choose the correct statement(s):
1. (a), (c)
2. (b), (c)
3. (c), (d)
4. (a), (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| (a) | on any surface. |
| (b) | if the charge is outside the surface. |
| (c) | could not be defined. |
| (d) | if charges of magnitude \(q\) were inside the surface. |
1. (a) and (d)
2. (a) and (c)
3. (b) and (d)
4. (c) and (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| (a) | the electric field is necessarily zero. |
| (b) | the electric field is due to the dipole moment of the charge distribution only. |
| (c) | the dominant electric field is \(\propto \dfrac 1 {r^3}\), for large \(r\), where \(r\) is the distance from the origin in this region. |
| (d) | the work done to move a charged particle along a closed path, away from the region, will be zero. |
Which of the above statements are true?
1. (b) and (d)
2. (a) and (c)
3. (b) and (c)
4. (c) and (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRefer to the arrangement of charges in the figure and a Gaussian surface of radius \(R\) with \(Q\) at the centre. Then:
| (a) | total flux through the surface of the sphere is \(\dfrac{-Q}{\varepsilon_0}\). |
| (b) | field on the surface of the sphere is \(\dfrac{-Q}{4\pi \varepsilon_0 R^2}.\) |
| (c) | flux through the surface of the sphere due to \(5Q\) is zero. |
| (d) | field on the surface of the sphere due to \(-2Q\) is the same everywhere. |
Choose the correct statement(s):
| 1. | (a) and (d) | 2. | (a) and (c) |
| 3. | (b) and (d) | 4. | (c) and (d) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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