- 1(current)
Q. No.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. | \(3 \pi \times 10^{-4}~ \text{H} /\text{m}\) | 2. | \(\pi \times 10^{-4}~ \text{H} /\text{m}\) |
| 3. | \(2 \pi \times 10^{-4} ~ \text{H} /\text{m}\) | 4. | \(4 \pi \times 10^{-4}~ \text{H} /\text{m}\) |
The dipole moment of each molecule of a paramagnetic gas is \(1.5\times10^{-23}~A-m^{2}.\) The temperature of the gas is and the number of molecules per unit volume in it are \(2\times10^{26}~m^{-3}.\) The maximum possible intensity of magnetization in the gas will be:
1. \(3\times10^{3}~A/m\)
2. \(4\times10^{-3}~A/m\)
3. \(5\times10^{5}~A/m\)
4. \(6\times10^{-4}~A/m\)
1. \(1.33\times10^8\)
2. \(0.75\times10^{-8}\)
3. \(12\times10^{-8}\)
4. \(14\times10^{-8}\)
What happens, when a magnetic substance is heated ?
| 1. | It loses its magnetism | 2. | It becomes a strong magnet |
| 3. | Does not effect the magnetism | 4. | Either (2) and (3) |
Of the following Fig., the lines of magnetic induction due to a magnet SN, are given by
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The coercivity of a bar magnet is 100A/m. It is to be demagnetised by placing it inside a solenoid of length 100 cm and number of turns 50. The current flowing the solenoid will be :-
1. 4A
2. 2A
3. 1A
4. zero
| 1. | thermal expansion |
| 2. | magnetisation and the movement of domains |
| 3. | electromagnetic radiation |
| 4. | electrical charges in the magnet |
1. \( 2.5 \times 10^5~ \text{A-} \text{m}^{-1} \)
2. \( 2.5 \times 10^{-5} \text{A-} \text{m}^{-1} \)
3. \( 1.25 \times 10^5 \text{A-} \text{m}^{-1} \)
4. \( 1.25 \times 10^{-5} \text{A-} \text{m}^{-1} \)
- 1(current)
Q. No.
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