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A long, straight wire carries a current \(i.\) The magnetizing field intensity \(H\) is measured at a point \(P\) close to the wire. A long, cylindrical iron rod is brought close to the wire so that the point \(P\) is at the center of the rod. The value of \(H\) at \(P\) will:
1.
increase many times
2.
decrease many times
3.
remain almost constant
4.
become zero
Subtopic: Magnetic Materials |
53%
Level 3: 35%-60%
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The magnetic field at the centre of a circular loop of area \(A\) is \(B.\) The magnetic moment of the loop is:
| 1. | \(\dfrac{BA^2}{\mu_0\pi}\) | 2. | \(\dfrac{BA\sqrt A}{\mu_0}\) |
| 3. | \(\dfrac{BA\sqrt A}{\mu_0\pi}\) | 4. | \(\dfrac{2BA\sqrt A}{\mu_0\sqrt\pi}\) |
Subtopic: Analogy between Electrostatics & Magnetostatics |
76%
Level 2: 60%+
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A current-carrying loop placed in a magnetic field behaves like a:
1. magnetic dipole
2. magnetic substance
3. magnetic pole
4. all are true
Subtopic: Analogy between Electrostatics & Magnetostatics |
55%
Level 3: 35%-60%
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The magnetic field, at a point \(10\) cm away, from a short bar magnet is \(3 \times 10^{-4}\) T, when the magnet is placed in an end-on position. If the magnet is in a broadside-on position, the field will be:
| 1. | \(6 \times 10^{-4}\) T | 2. | \(1.5 \times 10^{-4}\) T |
| 3. | \(3 \sqrt2 \times 10^{-4}\) T | 4. | \({\dfrac 3 {\sqrt 2}}\times 10^{-4}\) T |
Subtopic: Bar Magnet |
79%
Level 2: 60%+
Hints
A ferromagnetic material consists of domains in which the magnetic moments of the atoms are in the same direction within each domain. However, the domains are randomly oriented. A ferromagnetic material is placed in an external magnetic field. Then,
| 1. | all the domains grow in size. |
| 2. | all the domains shrink in size. |
| 3. | some domains grow in size, others shrink. |
| 4. | domains rotate in the magnetic field. |
Subtopic: Magnetic Materials |
Level 3: 35%-60%
Hints
The coercive force for a certain magnet is \(3 \times 10^3 ~\text{A/m}\). This magnet is placed within a solenoid having \(40~\text{turns/cm}\). What current should be passed through the solenoid so that the magnet is demagnetized?
| 1. | \(0.75~\text{A}\) | 2. | \(75~\text{A}\) |
| 3. | \(1.33~\text{A}\) | 4. | \(133~\text{A}\) |
Subtopic: Magnetization & Magnetic Intensity |
69%
Level 2: 60%+
Hints
A \(100\)-turn coil of wire of size \(2~\text{cm}\times 1.5~\text{cm}\) is suspended between the poles of a magnet producing a field of \(1~\text T,\) inside a galvanometer. Calculate the torque on the coil due to a current of \(0.1~\text{A}\) passing through the coil.
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
Subtopic: Bar Magnet |
81%
Level 1: 80%+
Hints
Correct relation between magnetic field \(B,\) magnetic intensity \(H,\) and intensity of magnetization \(I\) is:
1. \( B=\mu_{0}\left(H+I\right)\)
2. \(I=\mu_0\left(H+B\right)\)
3. \(H=\mu_0\left(I+B\right)\)
4. \(B=2H\left(I+\mu_0\right)\)
1. \( B=\mu_{0}\left(H+I\right)\)
2. \(I=\mu_0\left(H+B\right)\)
3. \(H=\mu_0\left(I+B\right)\)
4. \(B=2H\left(I+\mu_0\right)\)
Subtopic: Magnetization & Magnetic Intensity |
89%
Level 1: 80%+
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A short bar magnet of magnetic moment \(0.4~\text{JT}^{-1}\) is placed in a uniform magnetic field of \(0.16~\text{T}\). The magnet is in stable equilibrium when the potential energy is:
1. \(0.064~\text{J}\)
2. \(-0.064~\text{J}\)
3. zero
4. \(-0.082~\text{J}\)
1. \(0.064~\text{J}\)
2. \(-0.064~\text{J}\)
3. zero
4. \(-0.082~\text{J}\)
Subtopic: Analogy between Electrostatics & Magnetostatics |
85%
Level 1: 80%+
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Subtopic: Magnetization & Magnetic Intensity |
84%
Level 1: 80%+
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