The correct direction of the magnetic field in the given figures is shown by:

1.  2.
3. 4.
Subtopic:  Magnetic Field & Field Lines |
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The magnetic lines of force inside a bar magnet are:

1. from south to the north pole.

2. from north to the south pole.

3. not present.

4. intersecting each other.

Subtopic:  Magnetic Field & Field Lines |
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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 |
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Which one of the following is correct?

1. The magnetic field lines also represent the lines of force on a moving charged particle at every point.
2. Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.
3. A bar magnet exerts a torque on itself due to its own field.
4. Magnetic field arises due to stationary charges.

Subtopic:  Magnetic Field & Field Lines |
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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 |
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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. 3M/π
2. 2M/lπ
3. M/2
4. M

Subtopic:  Bar Magnet |
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Due to a small magnet, the intensity at a distance x in the end-on position is 9 gauss. What will be the intensity at a distance x2 on equatorial position?

1. 9 gauss

2. 4 gauss

3. 36 gauss

4. 4.5 gauss

Subtopic:  Bar Magnet |
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A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be:

1. M2,m2

2. M,m2

3. M2,m

4. M, m

Subtopic:  Bar Magnet |
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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 |
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The unit of pole strength is:

1. Am2

2. Am

3. A2m

4. A2m2

Subtopic:  Bar Magnet |
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