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Q. No.Given below are four statements:
| (a) | The total charge of the universe is constant. |
| (b) | The total positive charge of the universe is constant. |
| (c) | The total negative charge of the universe is constant. |
| (d) | The total number of charged particles in the universe is constant. |
Choose the correct option:
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Electric Charge |
65%
From NCERT
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Two positive charges each of charge \(q\) are kept at \((a, 0)\) and \((-a, 0).\) A negative charge \(q\) is kept at \((0, 0).\) If the negative charge is displaced \(y\) distance towards positive \(y\)-axis, then motion of the negative charge after disturbance will be:
(\(y<<a\))
(\(y<<a\))
| 1. | oscillatory motion |
| 2. | simple harmonic motion |
| 3. | will come to rest at centre |
| 4. | will continue moving along \(y\)-axis |
Subtopic: Coulomb's Law |
61%
From NCERT
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An electron, initially at rest, is subjected to a uniform electric field of magnitude \(2\times 10^{4}\) N/C. It accelerates and travels a distance of \(1.5~\text{cm}\) due to the field. The time taken by the electron to cover this distance is:
| 1. | \(1.3\times 10^{2}\) s | 2. | \(2.1\times 10^{-12}\) s |
| 3. | \(1.6\times 10^{-10}\) s | 4. | \(2.9\times 10^{-9}\) s |
Subtopic: Electric Field |
74%
From NCERT
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Two electric dipoles of dipole moments \(1.2\times10^{-30}\) C-m and \(2.4\times10^{-30}\) C-m are placed in two different uniform electric fields of strengths \(5\times10^{4}\) NC–1 and \(15\times10^{4}\) NC–1 respectively. The ratio of maximum torque experienced by the electric dipoles is \( \dfrac{1}{x}.\) The value of \(x \) is:
| 1. | \(2\) | 2. | \(4\) |
| 3. | \(6\) | 4. | \(8\) |
Subtopic: Electric Dipole |
89%
From NCERT
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A uniform electric field, \(\vec E=(a\widehat i+b\widehat j),\) intersects a surface of area \(A.\) What is the electric flux through this area if the surface lies in \(x\text-z\) plane?
| 1. | zero | 2. | \(aA\) |
| 3. | \(bA\) | 4. | \(A\sqrt{a^2+b^2}\) |
Subtopic: Gauss's Law |
59%
From NCERT
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If a body is charged by rubbing it, its weight:
| 1. | remains precisely constant. |
| 2. | increases slightly. |
| 3. | decreases slightly. |
| 4. | may increase slightly or may decrease slightly. |
Subtopic: Electric Charge |
65%
From NCERT
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The electric field, at the centre of a square with charges placed at its four vertices as shown in the figure, is: \(\left(k=\dfrac{1}{4\pi\varepsilon_0}\right)\)
| 1. | zero | 2. | \(4\dfrac{kq}{a^2}\) |
| 3. | \(2\dfrac{kq}{a^2}\) | 4. | \(2\sqrt2\dfrac{kq}{a^2}\) |
Subtopic: Electric Field |
70%
From NCERT
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When a soap bubble is given a negative charge, its radius:
1. increases
2. decreases
3. remains unchanged
4. nothing can be predicted
1. increases
2. decreases
3. remains unchanged
4. nothing can be predicted
Subtopic: Electric Field |
80%
From NCERT
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A system has two charges \(q_1=4.5\times 10^{-6}~\text{C}\) and \(q_2=-4.5\times 10^{-6}~\text{C}\) located at points \(A\text:(0,0,-20)~\text{cm}\) and \(B\text:(0,0,+20)~\text{cm},\) respectively. The electric dipole moment of the system is:
1. \(9\times 10^{-6}~\text{C-m}\)
2. \(1.8\times 10^{-7}~\text{C-m}\)
3. \(1.8\times 10^{-6}~\text{C-m}\)
4. \(9\times 10^{-7}~\text{C-m}\)
1. \(9\times 10^{-6}~\text{C-m}\)
2. \(1.8\times 10^{-7}~\text{C-m}\)
3. \(1.8\times 10^{-6}~\text{C-m}\)
4. \(9\times 10^{-7}~\text{C-m}\)
Subtopic: Electric Dipole |
69%
From NCERT
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An isosceles right angle triangle of side \(\mathrm{d}\) is placed in a horizontal plane. A point charge \({q}\) is placed at a distance \({d}\) vertically above one of the corners as shown in the figure. The flux of the electric field passing through the triangle is:
| 1. | \(\dfrac{q}{6} \varepsilon_{0}\) | 2. | \(\dfrac{q}{18} \varepsilon_{0}\) |
| 3. | \(\dfrac{q}{24} \varepsilon_{0}\) | 4. | \(\dfrac{q}{48} \varepsilon_{0}\) |
Subtopic: Gauss's Law |
52%
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