Q. No.The self-inductance of a coil in which an emf of \(20~\text V\) is induced when the current in the circuit changes uniformly from \(1~\text A\) to \(2.5~\text A\) in \(0.5~\text s\) is:
| 1. | \(\dfrac{20}{3}~\text H\) | 2. | \(\dfrac{40}{3}~\text H\) |
| 3. | \(\dfrac{17}{3}~\text H\) | 4. | \(\dfrac{50}{3}~\text H\) |
Subtopic: Self - Inductance |
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When the current in a coil changes from \(5~\text{A}\) to \(2~\text{A}\) in \(0.1~\text{s},\) the average voltage of \(50~\text{V}\) is produced. The self-inductance of the coil is:
1. \(1.67~\text{H}\)
2. \(6~\text{H}\)
3. \(3~\text{H}\)
4. \(0.67~\text{H}\)
1. \(1.67~\text{H}\)
2. \(6~\text{H}\)
3. \(3~\text{H}\)
4. \(0.67~\text{H}\)
Subtopic: Self - Inductance |
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A coil of resistance \(10\) ohm and inductance \(5\) henry is connected to a \(100\) volt battery. The energy stored in the coil is:
1. \(250\text{ joule}\)
2. \(250\text{ erg}\)
3. \(125\text{ joule}\)
4. \(125\text{ erg}\)
1. \(250\text{ joule}\)
2. \(250\text{ erg}\)
3. \(125\text{ joule}\)
4. \(125\text{ erg}\)
Subtopic: Self - Inductance |
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A long solenoid has \(1000\) turns. When a current of \(4~\text{A}\) flows through it, the magnetic flux linked with each turn of the solenoid is \(4\times 10^{-3}~\text{Wb}\). The self-inductance of the solenoid is:
1. \(3~\text{H}\)
2. \(2~\text{H}\)
3. \(1~\text{H}\)
4. \(4~\text{H}\)
Subtopic: Self - Inductance |
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Level 1: 80%+
NEET - 2016
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An inductor coil of self-inductance \(10~\text{H}\) carries a current of \(1~\text{A}\). The magnetic field energy stored in the coil is:
| 1. | \(10~\text{J}\) | 2. | \(2.5~\text{J}\) |
| 3. | \(20~\text{J}\) | 4. | \(5~\text{J}\) |
Subtopic: Self - Inductance |
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NEET - 2022
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An average induced EMF of \(0.2~\text{V}\) appears in a coil when the current in it is changed from \(5.0~\text{A}\) in one direction to \(5.0~\text{A}\) in the opposite direction within \(0.2~\text{s}\). The self‐inductance of the coil will be:
| 1. | \( 4.0 \times 10^{-3} ~\text{H} \) | 2. | \( 4.0 \times 10^{-4} ~\text{H} \) |
| 3. | \( 2.0 \times 10^{-3}~ \text{H} \) | 4. | \( 2.0 \times 10^{-4} ~\text{H}\) |
Subtopic: Self - Inductance |
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The current through a choke coil increases from zero to 6 A in 0.3 seconds and an induced emf of 30 V is produced. The inductance of the coil is
1. 5 H
2. 2.5 H
3. 1.5 H
4. 2 H
Subtopic: Self - Inductance |
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Given below are two statements:
| Statement I: | Energy is stored by a current-carrying inductance, and this is proportional to the square of the current. |
| Statement II: | The EMF developed by an inductance is proportional to the rate of change of current. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Self - Inductance |
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If a current of \(10\) A in a coil of self-inductance \(5\) mH is cut off in time \(0.1\) s, then induced EMF in the coil is:
1. \(0.5\text{ V}\)
2. \(50\text{ mV}\)
3. \(5\text{ mV}\)
4. \(0.5\text{ mV}\)
1. \(0.5\text{ V}\)
2. \(50\text{ mV}\)
3. \(5\text{ mV}\)
4. \(0.5\text{ mV}\)
Subtopic: Self - Inductance |
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A current of \(0.2\) A flowing through a coil is increasing at a constant rate of \(0.4\) A/s. If the power flowing through the coil is \(0.4\) W, the self-inductance of the coil will be:
1. \(1.25\) H
2. \(2.5\) H
3. \(5\) H
4. \(10\) H
1. \(1.25\) H
2. \(2.5\) H
3. \(5\) H
4. \(10\) H
Subtopic: Self - Inductance |
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