If all linear dimensions of an inductor are tripled, then self-inductance will become (keeping the total number of turns per unit length constant)

1.  3 times

2.  9 times

3.  27 times

4. 1/3 times

Subtopic:  Self - Inductance |
From NCERT
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A coil of resistance 20Ω and inductance 5H has been connected to a 200 V battery. The maximum energy stored in the coil is

(1) 250 J

(2) 125 J

(3) 500 J

(4) 100 J

Subtopic:  Self - Inductance |
 80%
From NCERT
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A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then 

(1) Intensity of the bulb remains the same

(2) Intensity of the bulb decreases

(3) Intensity of the bulb increases

(4) The bulb ceases to glow

Subtopic:  Self - Inductance |
From NCERT
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The inductance of a coil is 60μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 second. The magnitude of the induced e.m.f. is 

(1) 60 × 10–6 V

(2) 300 × 10–4 V

(3) 30 × 10–4 V

(4) 3 × 10–4 V

Subtopic:  Self - Inductance |
 82%
From NCERT
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The self inductance of a coil is L. Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be 

(1) 14L

(2) L

(3) 4 L

(4) 16 L

Subtopic:  Self - Inductance |
 73%
From NCERT
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Pure inductance of 3.0 H is connected as shown below. The equivalent inductance of the circuit is

(1) 1 H

(2) 2 H

(3) 3 H

(4) 9 H

Subtopic:  Self - Inductance |
 75%
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If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is 

(1) 25H

(2) 45H

(3) 54H

(4) 1 H

Subtopic:  Self - Inductance |
 94%
From NCERT
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The adjoining figure shows two bulbs \(B_1\) and \(B_2\) resistor \(R\) and an inductor \(L\). When the switch \(S\) is turned off 

1. Both \(B_1\) and \(B_2\) die out promptly.
2. Both \(B_1\) and \(B_2\) die out with some delay.
3. \(B_1\) dies out promptly but \(B_2\) with some delay.
4.  \(B_2\) dies out promptly but \(B_1\) with some delay.
Subtopic:  Self - Inductance |
From NCERT
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In the figure magnetic energy stored in the coil is 

(1) Zero

(2) Infinite

(3) 25 joules

(4) None of the above

Subtopic:  Self - Inductance |
 83%
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If induction of magnetic field at a point is B and energy density is U, then which of the following graphs is correct?

1. 

2. 

3. 
4. 

Subtopic:  Self - Inductance |
 62%
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