| 1. | \(M\) | 2. | \(\sqrt{2} M\) |
| 3. | \(3 M\) | 4. | \(2 M\) |
What is the magnetic dipole moment of the given loop?
| 1. | \({ 5 \over 2} \pi R^2I\) | 2. | \(3 \pi R^2I\) |
| 3. | \({ 3 \over 2} \pi R^2I\) | 4. | \(5 \pi R^2I\) |
The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as :
1.
2.
3. r
4.
A small coil of N turns has an effective area A and carries a current I. It is suspended in a horizontal magnetic field such that its plane is perpendicular to . The work done in rotating it by about the vertical axis is
1. 2.
3. 4.
An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron's charge)
1. evr
2. evr
3. ev
4. 2rev
Four wires each of length \(2.0\) metres are bent into four loops \(P,Q,R~\text{and}~S\) and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct?
| 1. | Couple on loop \(P\) will be the highest |
| 2. | Couple on loop \(Q\) will be the highest |
| 3. | Couple on loop \(R\) will be the highest |
| 4. | Couple on loop \(S\) will be the highest |
A straight wire carrying a current i is turned into a circular loop. If the magnitude of the magnetic moment associated with it in M.K.S. unit is M, the length of wire will be
1. 2.
3. 4.
A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field . The torque acting on the coil is
1. 0.32 Nm tending to rotate the side AD out of the page
2. 0.32 Nm tending to rotate the side AD into the page
3. 0.0032 Nm tending to rotate the side AD out of the page
4. 0.0032 Nm tending to rotate the side AD into the page
1. \(1\times 10^{-15}\)
2. \(1\times 10^{-10}\)
3. \(1\times 10^{-23}\)
4. \(1\times 10^{-27}\)
If the angular momentum of an electron is then the magnitude of the magnetic moment will be
1.
2.
3. ej.2m
4.
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