Q. No.If the planes of two identical concentric coils are perpendicular and the magnetic moment of each coil is \(M,\) then the resultant magnetic moment of the two-coil system will be:
1.
\(M\)
2.
\(\sqrt{2} M\)
3.
\(3 M\)
4.
\(2 M\)
Which of the following graphs correctly represents the variation of magnetic field induction with distance due to a thin wire carrying current?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
When an electron enters perpendicularly in a magnetic field with velocity v, time period of its revolution is T. If it enters in the same magnetic field with a velocity 2v, then its time period will be:
1. 2T
2. 4T
3.
4. T
A positively charged particle descends vertically. In which direction will the horizontal component of the earth's magnetic field deflect?
1. east
2. west
3. north
4. south
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 field at center due to the orbital motion of the electron in the hydrogen atom is :
1. 12.5 tesla
2. 5 tesla
3. 24 tesla
4. 1 tesla
The figure shows a particle of charge q and mass m moving with velocity v along the x-axis enters a region of the uniform magnetic field. The minimum value of v so that the charge q is deflected by an angle is
1.
2.
3.
4.
An electron is traveling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:
1. Straight-line along the x-direction
2. A circle in the xz-plane
3. A circle in the yz-plane
4. A circle in the xy-plane
| 1. | \(B\) acts along the \(x\text-\)axis |
| 2. | \(B\) acts along the \(y\text-\)axis |
| 3. | \(B\) acts along the \(z\text-\)axis |
| 4. | \(B\) can act along any of the above direction for the net force to be zero |
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)
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