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Q. No.Given below are two statements:
Assertion (A):
When charges are shared between any two bodies, no charge is really lost but some loss of energy does occur.
Reason (R):
Some energy disappears in the form of heat, sparking, etc.
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 Charge |
From NCERT
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Given below are two statements:
| Assertion (A): | Work done in moving a charge between any two points in a uniform electric field is independent of the path followed by the charge between these points. |
| Reason (R): | Electrostatic forces are non-conservative. |
| 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 |
76%
From NCERT
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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:
(\(\varepsilon_0 \)-permittivity of free space)
1. \(\frac{13q}{4\pi \varepsilon_0r^2}\)
2. zero
3. \(\frac{q}{4\pi \varepsilon_0r^2}\)
4. \(\frac{12q}{4\pi \varepsilon_0r^2}\)
Subtopic: Electric Field |
62%
From NCERT
NEET - 2022
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Given below are two statements:
| Statement I: | Gauss's law for electric fields is a consequence of the conservation of energy. |
| Statement II: | Coulomb's law for electric charges leads to a conservative electric field. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Gauss's Law |
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | The number of field lines drawn from a charge is proportional to the magnitude of the charge. |
| Reason (R): | The electric field at any point is proportional to the magnitude of the source charge. |
In the light of the above statements choose the correct answer from the options given below:
| 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. | Both (A) and (R) are false. |
Subtopic: Electric Field |
71%
From NCERT
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Hints
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Consider two charges, \(+q\) and \(-q\) \((q>0)\) placed at a distance \(2a\) from each other. At the point M (see figure below), the electric field makes an angle \(\phi\) from the \(x \)-axis. The correct value of \(\phi\) is:
1. \(0^\circ\)
2. \(90^\circ\)
3. \(180^\circ\)
4. \(270^\circ\)
1. \(0^\circ\)
2. \(90^\circ\)
3. \(180^\circ\)
4. \(270^\circ\)
Subtopic: Electric Field |
From NCERT
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Hints
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Two charged particles \(P\) and \(Q\) are \(0.10~\mathrm{m}\) apart. The charge on \(P\) is \(1.50\times10^{-7}~\mathrm{C}\) and the charge on \(Q\) is \(1.50\times10^{-7}~\mathrm{C}\). Particle \(P\) experiences an electrostatic force of magnitude \(F\) because it is near to the charge on particle \(Q\). The distance between the two particles is increased to \(0.20~\mathrm{m}\). The charge on \(P\) increases to \(4.50\times10^{-7}~\mathrm{C}\)and the charge on \(Q\) increases to \(6.00\times10^{-7}~\mathrm{C}\) . What is the magnitude of the force that particle \(P\) experiences now?
1. \(\frac {F}{4}\)
2. \(12F\)
3. \(6F\)
4. \(3F\)
1. \(\frac {F}{4}\)
2. \(12F\)
3. \(6F\)
4. \(3F\)
Subtopic: Coulomb's Law |
70%
From NCERT
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The ratio of coulomb's electrostatic force to the gravitational force between an electron and a proton separated by some distance is \(2.4\times 10^{39}\). The ratio of the proportionality constant, \(K=\frac{1}{4\pi\varepsilon_0}\) to the gravitational constant \(G\) is nearly:
(Given that the charge of the proton and electron each \(=1.6\times 10^{-19}\), the mass of the electron = \(9.11\times 10^{-31}\) kg, the mass of the proton \(=1.67\times 10^{-27}\) kg):
(Given that the charge of the proton and electron each \(=1.6\times 10^{-19}\), the mass of the electron = \(9.11\times 10^{-31}\) kg, the mass of the proton \(=1.67\times 10^{-27}\) kg):
| 1. | \(10^{20}\) | 2. | \(10^{30}\) |
| 3. | \(10^{40}\) | 4. | \(10\) |
Subtopic: Coulomb's Law |
60%
From NCERT
NEET - 2022
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A charge q is placed in a cube of side b. The flux associated with the cube is independent of side length. |
| Reason (R): | Gauss's law is independent of the size of the Gaussian surface. |
In the light of the above statements choose the correct answer from the options given below:
| 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. | Both (A) and (R) are false. |
Subtopic: Gauss's Law |
87%
From NCERT
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Given below are two statements:
| Assertion (A): | If electrons in an atom were stationary, then they would fall into the nucleus. |
| Reason (R): | Electrostatic force of attraction acts between negatively charged electrons and positive nucleus. |
| 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: Coulomb's Law |
66%
From NCERT
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