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. |
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. |
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. |
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. |
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. |
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. | \(\dfrac{13q}{4\pi \varepsilon_0r^2}\) | 2. | zero |
3. | \(\dfrac{q}{4\pi \varepsilon_0r^2}\) | 4. | \(\dfrac{12q}{4\pi \varepsilon_0r^2}\) |
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. |
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. |
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. |