The bar magnet \(A\) of magnetic moment \(M_A\) is found to oscillate at a frequency twice that of magnet \(B\) of magnetic moment \(M_B\) and the same moment of inertia when placed in a vibration magnetometer. We may say that:
1. | \(M_B=8M_A\) | 2. | \(M_A= 4M_B\) |
3. | \(M_A=8M_B\) | 4. | \(M_A=2M_B\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\). Now the torque required to keep the magnet in this new position is:
1. \(\frac{W}{\sqrt{3}}\)
2. \(\sqrt{3} W\)
3. \(\frac{\sqrt{3} W}{2}\)
4. \(\frac{2 W}{\sqrt{3}}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe magnetic moment of a short dipole is \(100\) A-m2. The magnetic induction in vacuum at \(1\) m from the dipole on the axis of the dipole is:
1. | \(2\times10^{-5}~\text{T}\) | 2. | \(10^{-5}~\text{T}\) |
3. | \(2~\mu\text{T}\) | 4. | \(1~\mu\text{T}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA short bar magnet of magnetic moment \(0.4\) JT–1 is placed in a uniform magnetic field of \(0.16\) T. The magnet is in stable equilibrium when the potential energy is:
1. \(0.064\) J
2. zero
3. \(-0.082\) J
4. \(-0.064\) J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA closely wound solenoid of \(2000\) turns and area of cross-section \(1.5\times10^{-4}\) m2 carries a current of \(2.0\) A. It is suspended through its center and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field \(5\times 10^{-2}\) tesla making an angle of \(30^{\circ}\) with the axis of the solenoid. The torque on the solenoid will be:
1. \(3\times 10^{-3}\) Nm
2. \(1.5\times 10^{-3}\) Nm
3. \(1.5\times 10^{-2}\) Nm
4. \(3\times 10^{-2}\) Nm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA magnet is parallel to a uniform magnetic field. If it is rotated by \(60^{\circ}\), the work done is \(0.8\) J. How much work is done in moving it \(30^{\circ}\) further?
1. \(0.8\times 10^{7}~\text{ergs}\)
2. \(0.4~\text{J}\)
3. \(8~\text{J}\)
4. \(0.8~\text{ergs}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMagnets \(A\) and \(B\) are geometrically similar but the magnetic moment of \(A\) is twice that of \(B\). If \(T_1\) and \(T_2\) be the time periods of the oscillation when their like poles and unlike poles are kept together respectively, then \(\frac{T_1}{T_2}\) will be:
1. \(\frac{1}{3}\)
2. \(\frac{1}{2}\)
3. \(\frac{1}{\sqrt{3}}\)
4. \(\sqrt{3}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA current-carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III & IV. The decreasing order of potential energy is:
1. | I > III > II > IV | 2. | I > II >III > IV |
3. | I > IV > II > III | 4. | III > IV > I > II |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo bar magnets are held together tightly in a vibration magnetometer. When their like poles are together, they make \(20\) oscillations per minute and when their unlike poles are together, they make \(8\) oscillations per minute. The ratio of the magnetic dipole moments of two bar magnets is:
1. \(29:21\)
2. \(6:15\)
3. \(1:6\)
4. \(25:4\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology