The following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole. Which configuration has the highest net magnetic dipole moment? 

1. 2.
3. 4.
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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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 |
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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 in-
1. direction along OP
2. direction along PQ
3. direction perpendicular to the plane of paper
4. zero

Subtopic:  Bar Magnet |
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A bar magnet having a magnetic moment of 2 x 104 JT-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 x 10-4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60° from the field is:
1. 0.6 J
2. 12 J
3. 6 J
4. 2 J
Subtopic:  Bar Magnet |
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A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled:

1. motion remains S.H.M. with time period = T/2
2. motion remains S.H.M. with time period = 2T
3. motion remains S.H.M. with time period = 4T
4. motion remains S.H.M. with time and period remains nearly constant
Subtopic:  Bar Magnet |
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Two bar magnets having the same geometry with magnetic moments M and 2M, are firstly placed in such a way that if their similar poles are on the same side then its time period of oscillation is T1. Now if the polarity of one of the magnets is reversed then the time period of oscillation is T2. The relation between T1 & T2 is:

1. T1<T2

2. T1=T2

3. T1>T2

4. T2=

Subtopic:  Bar Magnet |
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For a vibration magnetometer, the time period of the suspended bar magnet can be reduced by:

1.  moving it towards the south pole
2.  moving it towards the north pole
3.  moving it towards the equator
4.  anyone of them

Subtopic:  Bar Magnet |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology