Which of the following is the correct representation of magnetic field lines?

 

1. (g), (c)

2. (d), (f)

3. (a), (b)

4. (c), (e)

Subtopic:  Magnetic Field & Field Lines |
 86%
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If a magnetic needle is made to vibrate in uniform field H, then its time period is T. If it vibrates in the field of intensity 4H, its time period will be:

1. 2T                            

2. T/2

3. 2/T                           

4. T

Subtopic:  Bar Magnet |
 80%
From NCERT
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A bar magnet of length \(‘l’\) and magnetic dipole moment \(‘M’\) is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:

1. \(\frac{3M}{\pi}\) 2. \(\frac{2M}{l\pi}\)
3. \(\frac{M}{ 2}\) 4. \(M\)
Subtopic:  Bar Magnet |
 77%
From NCERT
AIPMT - 2013
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Due to a small magnet, the intensity at a distance \(x\) in the end-on position is \(9~\text{gauss}\). What will be the intensity at a distance \(\frac{x}{2}\) on equatorial position?
1. \(9~\text{gauss}\)
2. \(4~\text{gauss}\)
3. \(36~\text{gauss}\)
4. \(4.5~\text{gauss}\)

Subtopic:  Bar Magnet |
 74%
From NCERT
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Figure shows two small identical magnetic dipoles a and b of magnetic moments M each, placed at a separation 2d, with their axes perpendicular to each other. The magnetic field at the point P midway between the dipoles is:

1. 2μ0M4πd3

2. μ0M4πd3

3. Zero

4. 5μ0M4πd3

Subtopic:  Bar Magnet |
 68%
From NCERT
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The unit of pole strength is:

1. Am2

2. Am

3. A2m

4. A2m2

Subtopic:  Bar Magnet |
 69%
From NCERT
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Two similar bar magnets P and Q, each of magnetic moment M, are taken. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have:

1. equal pole strength           
2. magnetic moment M/4
3. magnetic moment M/2     
4. magnetic moment M



 

Subtopic:  Bar Magnet |
 68%
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Two equal bar magnets are kept as shown in the figure. The direction of the resultant magnetic field, indicated by arrowhead at the point P is: (approximately)

         

1. 2.
3. 4.
Subtopic:  Bar Magnet |
 64%
From NCERT
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A vibration magnetometer placed in a magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 s in the earth's horizontal magnetic field of 24 μT. When a horizontal field of 18 μT is produced opposite to the earth's field by placing a current-carrying wire, the new time period of the magnet will be:

1. 1 s

2. 2 s

3. 3 s

4. 4 s

Subtopic:  Bar Magnet |
 64%
From NCERT
AIPMT - 2010
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Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure.

The force on the charge Q is:

1. zero.
2. directed along with OP.
3. directed along with PO.
4. directed perpendicular to the plane of the paper.

Subtopic:  Bar Magnet |
 65%
From NCERT
NEET - 2010
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