Q. No.The self-inductance of a coil in which an emf of \(20\) V is induced when the current in the circuit changes uniformly from \(1\) A to \(2.5\) A in \(0.5\) s is:
1. \(\dfrac{20}{3}\) H
2. \(\dfrac{40}{3}\) H
3. \(\dfrac{17}{3}\) H
4. \(\dfrac{50}{3}\) H
1. \(\dfrac{20}{3}\) H
2. \(\dfrac{40}{3}\) H
3. \(\dfrac{17}{3}\) H
4. \(\dfrac{50}{3}\) H
Subtopic: Â Self - Inductance |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Bulb generally get fused when they are switched on or off. |
| Reason (R): | When we switch on or off, a circuit current changes in it rapidly. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Self - Inductance |
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At an instant, current in the network shown below is \(5\) A. If the current is increasing at the rate of \(2\) A/s, then the potential difference between \(A\) and \(B\) \((V_A-V_B)\) is:
| 1. | \(25\) V | 2. | \(40\) V |
| 3. | \(30\) V | 4. | \(60\) V |
Subtopic: Â Self - Inductance |
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Given below are two statements:
| Assertion (A): | A small resistor (i.e., a lamp) is usually applied in parallel to the current-carrying coil of an electromagnet. |
| Reason (R): | During switching off, high voltage is induced across the open switch causing sparks and damage to the insulation. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Self - Inductance |
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The current in an inductor of self-inductance \(4~\text{H}\) changes from \(4~ \text{A}\) to \(2~\text{A}\) in \(1~ \text s\). The emf induced in the coil is:
1. \(-2~\text{V}\)
2. \(2~\text{V}\)
3. \(-4~\text{V}\)
4. \(8~\text{V}\)
Subtopic: Â Self - Inductance |
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From NCERT
NEET - 2022
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Current in a circuit falls from \(5.0\) A to \(0\) A in \(0.1~\text{s}\). If an average emf of \(200\) V is induced, the self-inductance of the circuit is:
1. \(4\) H
2. \(2\) H
3. \(1\) H
4. \(3\) H
Subtopic: Â Self - Inductance |
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The network shown in the figure is part of a complete circuit. If at a certain instant, the current \(I\) is \(5~\text{A}\) and it is decreasing at a rate of \(5\times 10^{3}~\text{A/s}\), then \(V_B-V_A\)
| 1. | \(20~\text{V}\) | 2. | \(15~\text{V}\) |
| 3. | \(10~\text{V}\) | 4. | \(5~\text{V}\) |
Subtopic: Â Self - Inductance |
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A long solenoid has \(500\) turns. When a current of \(2\) A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is \(4\times 10^{-3} \) Wb. The self-inductance of the solenoid is:
1. \(2.5\) H
2. \(2.0\) H
3. \(1.0\) H
4. \(4.0\) H
1. \(2.5\) H
2. \(2.0\) H
3. \(1.0\) H
4. \(4.0\) H
Subtopic: Â Self - Inductance |
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AIPMT - 2008
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A coil is wound on a cylinder in a close helical form. If all the linear dimensions of the solenoid are increased by a factor of \(2\) and the number of turns per unit length of the coil remains the same, the self-inductance increases by a factor of:
1. \(16\)
2. \(12\)
3. \(8\)
4. \(4\)
1. \(16\)
2. \(12\)
3. \(8\)
4. \(4\)
Subtopic: Â Self - Inductance |
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A constant current \(i\) is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the solenoid along its axis?
| (a) | magnetic field at the centre |
| (b) | magnetic flux linked with the solenoid |
| (c) | self-inductance of the solenoid |
| (d) | rate of Joule heating |
Choose the correct option:
1. (a), (b), (c)
2. (b), (c)
3. (c), (d)
4. (a), (b), (d)
Subtopic: Â Self - Inductance |
 60%
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