1. | material \(A\) is preferred for making electromagnets. |
2. | material \(B\) is preferred for making permanent magnets. |
3. | material \(A\) is preferred for using electric generators and transformers. |
4. | all of these. |
1. | ![]() |
2. | ![]() |
3. | ![]() |
4. | ![]() |
1. | \((30\widehat k)\) N-m | 2. | \((10\widehat i+20\widehat j)\) N-m |
3. | \((20\widehat k)\) N-m | 4. | \((-30\widehat k)\) N-m |
1. | A/m | 2. | Am |
3. | Am2 | 4. | tesla |
1. | attract all three of them |
2. | attract \(N_1\) and \(N_2\) strongly but repel \(N_3\) weakly |
3. | attract \(N_1\) strongly, \(N_2\) weakly and repel \(N_3\) weakly |
4. | attract \(N_1\) strongly, but repel \(N_2\) and \(N_3\) weakly |
1. | \(\dfrac{\pi}{\mu_0}\left(B_eR^3\right )\) | 2. | \(\dfrac{2\pi}{\mu_0}\left(B_eR^3\right )\) |
3. | \(\dfrac{4\pi}{\mu_0}\left(B_eR^3\right )\) | 4. | \(\dfrac{2}{\mu_0}\left(B_eR^3\right )\) |
Statement I: | The magnetic field of a circular loop at very far away point on the axial line varies with distance as like that of a magnetic dipole. |
Statement II: | The magnetic field due to magnetic dipole varies inversely with the square of the distance from the centre on the axial line. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is correct. |
3. | Both Statement I and Statement II are correct. |
4. | Both Statement I and Statement II are incorrect. |