Two short magnets with their axes horizontally perpendicular to the magnetic meridian are placed with their centres 40 cm east and 50 cm west of the magnetic needle. If the needle remains undeflected, the ratio of their magnetic moments is
(1) 4:5
(2) 16:25
(3) 64:125
(4) 2:
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle is
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strength B. The work done in rotating it by an angle of 180o will be
(1) -MB
(2) +MB
(3) 0
(4) +2MB
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA magnetic needle is kept in a non-uniform magnetic field. It experiences:
1. A force and a torque
2. A force but not a torque
3. A torque but not a force
4. Neither a torque nor a force
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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.
2.
3.
4. M, m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo identical thin bar magnets each of length l and pole strength m are placed at the right angle to each other with the north pole of one touching south pole of the other. The magnetic moment of the system is :
1. ml
2. 2ml
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRate of change of torque with deflection is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
(a) (b)
(c) (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyForce between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to
1. 2.4N 2. 1.2N
3. 0.6N 4. 0.3N
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA bar magnet of magnetic moment 104J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4×10–5 T to a direction 60° from the field will be
1. 0.2 J 2. 2.0 J
3. 4.18 J 4. 2 × 102 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology