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Q. No.An electric dipole is placed in an electric field generated by a point charge.
(a)
The net electric force on the dipole must be zero.
(b)
The net electric force on the dipole may be zero.
(c)
The torque on the dipole due to the field must be zero.
(d)
The torque on the dipole due to the field may be zero.
Choose the correct option:
1.
(a) only
2.
(b), (c)
3.
(c), (d)
4.
(d) only
Subtopic: Electric Dipole |
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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%
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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%
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Given below are two statements:
| Assertion (A): | Point charges \(q_{1}\) and \(q_{2}\) produce electric field of magnitude \(E_{1}\) and \(E_{2}\) at a point and potential \(V_{1}\) and \(V_{2}\) at the same point. The electric field due to both the charges at that point must be \(E_{1}+E_{2}.\) |
| Reason (R): | The electric potential at that point due to both the charges must be \(V_{1}+V_{2}.\) |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Electric Field |
60%
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Which of the following is not the property of electric charge?
| 1. | Charge on any body is quantised. |
| 2. | Charge on any isolated system remains conserved. |
| 3. | Unlike mass, the charge is non-relativistic. |
| 4. | Unlike charged bodies always repel each other. |
Subtopic: Electric Charge |
84%
From NCERT
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In an experiment, two bodies are rubbed against each other, resulting in each body acquiring a charge of \(1~\text{C}.\) How many electrons are transferred from one body to the other during the rubbing process?
| 1. | \(6.25\times10^{20}\) | 2. | \(1.6\times10^{19}\) |
| 3. | \(6.25\times10^{18}\) | 4. | \(1.6\times10^{-19}\) |
Subtopic: Electric Charge |
78%
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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 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%
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If \(\vec E=\dfrac{E_0x}{a}(\widehat i),\) then electric flux through the cube of side \(a,\) as shown in the figure, will be:
(where \(x\) is in metre)
1. zero
2. \(E_0a^2\)
3. \(E_0a^3\)
4. \(E_0a\)
(where \(x\) is in metre)
1. zero
2. \(E_0a^2\)
3. \(E_0a^3\)
4. \(E_0a\)
Subtopic: Gauss's Law |
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Two positive charges, each of charge \(q,\) are placed at coordinates \((a,0)\) and \((-a,0).\) A negative charge \(q\) is released from the position \((0,a).\) What is the expression for the electrostatic force acting on the negative charge at this point?
| 1. | \( \dfrac{q^{2}}{2 \pi \varepsilon_{0} a^{2}}\) | 2. | \( \dfrac{q^{2}}{4 \pi \varepsilon_{0} a^{2}}\) |
| 3. | \(\dfrac{q^{2}}{4 \sqrt{2} \pi \varepsilon_{0} a^{2}}\) | 4. | \( \dfrac{q^{2}}{\pi \varepsilon_{0} a}\) |
Subtopic: Coulomb's Law |
60%
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