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A current-carrying circular loop of radius R is placed in the x-y plane with center at the origin. Half of the loop with x > 0 is now bent so that it now lies in the y-z plane.
| 1. | The magnitude of the magnetic moment now diminishes. |
| 2. | The magnetic moment does not change. |
| 3. | The magnitude of B at (0, 0, z), z >>R increases. |
| 4. | The magnitude of B at (0, 0, z), z >>R is unchanged. |
Subtopic: Â Magnetic Moment |
Level 3: 35%-60%
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The gyro-magnetic ratio of an electron in an H-atom, according to the Bohr model, is:
| 1. | independent of which orbit it is in. |
| 2. | negative. |
| 3. | positive. |
| 4. | increases with the quantum number \(n\). |
Subtopic: Â Magnetic Moment |
 58%
Level 3: 35%-60%
Hints
A toroid of \(n\) turns, mean radius \(R\) and cross-sectional radius \(a\) carries current \(I\). It is placed on a horizontal table taken as \(x-y\) plane. Its magnetic moment \(m\)
1. is non-zero and points in the \(z\)-direction by symmetry.
2. points along the axis of the tortoid \(( {m}=m \hat{{\phi}}).\)
3. is zero, otherwise there would be a field falling as \(\frac{1}{r^3}\) at large distances outside the toroid.
4. is pointing radially outwards.
1. is non-zero and points in the \(z\)-direction by symmetry.
2. points along the axis of the tortoid \(( {m}=m \hat{{\phi}}).\)
3. is zero, otherwise there would be a field falling as \(\frac{1}{r^3}\) at large distances outside the toroid.
4. is pointing radially outwards.
Subtopic: Â Magnetic Moment |
 50%
Level 3: 35%-60%
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