Which of the following statement is incorrect?
(1) If a bar magnet is cut into two pieces transverse to its length and along its length, in either case, one gets two magnets, each with a north and south pole.
(2) A magnetized needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to torque.
(3) Every magnetic configuration must have a north pole and a south pole.
(4) In a bar magnet, the intensity of the magnetic field is the strongest at the two ends (poles) and weakest at the central region.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the figure, the magnetic needle has a magnetic moment of 6.7 × 10–2 Am2 and a moment of inertia I = 7.5 × 10–6 kg m2. It performs 10 complete oscillations in 6.70 s in a magnetic field. What is the magnitude of the magnetic field?
1. 0.02 T
2. 0.01 T
3. 003 T
4. 0.001 T
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. What is the magnetic moment of the magnet?
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 N-m. What is the work done in moving it from its most stable to the most unstable position?
1. 0.036 J
2. 0.016 J
3. 0.064 J
4. 0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA solenoid of cross-sectional area and 1000 turns placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. The current flowing through the solenoid is:
1. 2 A
2. 4 A
3. 1 A
4. 5 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology