A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is 

(1) 3.5 sec

(2) 4.0 sec

(3) 4.5 sec

(4) 5.0 sec

Subtopic:  LR circuit |
 58%
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Hints

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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NEET 2023 - Target Batch - Aryan Raj Singh

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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An inductance L and a resistance R are first connected to a battery. After some time the battery is disconnected but L and R remain connected in a closed circuit. Then the current reduces to 37% of its initial value in time ?

(1) RL sec

(2) RLsec

(3) LRsec

(4) 1LRsec

Subtopic:  LR circuit |
 78%
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In an LR-circuit, the time constant is that time in which current grows from zero to the value (where I0 is the steady-state current) 

(1) 0.63 I0

(2) 0.50 I0

(3) 0.37 I0

(4) I0

Subtopic:  LR circuit |
 76%
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Hints

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%
From NCERT
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A copper rod of length l is rotated about one end perpendicular to the magnetic field B with constant angular velocity ω. The induced e.m.f. between the two ends is 

(1) 12Bωl2

(2) 34Bωl2

(3) Bωl2

(4) 2Bωl2

Subtopic:  Motional emf |
 89%
From NCERT
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Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >> R2, the mutual inductance M between them will be directly proportional to 

(1) R1/R2

(2) R2/R1

(3) R12/R2

(4) R22/R1

Subtopic:  Mutual Inductance |
 63%
From NCERT
NEET - 2021
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A thin semicircular conducting ring of radius R is falling with its plane vertical in a horizontal magnetic induction B. At the position MNQ, the speed of the ring is v and the potential difference developed across the ring is:

   

1.  Zero
2. \(B v \pi R^2 / 2\) and M is at the higher potential 
3. \(2 R B v\) and is at the higher potential
4. \(2RBv\) and Q  is at the higher potential

Subtopic:  Motional emf |
 65%
From NCERT
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