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Q. No.In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:
1. BA and CD
2. AB and CD
3. BA and DC
4. AB and DC
1. BA and CD
2. AB and CD
3. BA and DC
4. AB and DC
Subtopic: Faraday's Law & Lenz Law |
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NEET - 2024
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A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
Choose the correct statement(s) from the options given below:
1. A and C only
2. A, C and D only
3. C only
4. B and D only
| A. | hold the sheet there if it is magnetic. |
| B. | hold the sheet there if it is non-magnetic. |
| C. | move the sheet away from the pole with uniform velocity if it is conducting. |
| D. | move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar. |
1. A and C only
2. A, C and D only
3. C only
4. B and D only
Subtopic: Faraday's Law & Lenz Law |
56%
From NCERT
NEET - 2024
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An ideal inductor-resistor-battery circuit is switched on at t=0 s. At time t, the current is i=i0(1−e(−tτ))A, where i0 is the steady-state value. The time at which the current becomes 0.5i0 is: [Given ln(2)=0.693]
1. 6.93×103 s
2. 6.93 ms
3. 69.3 s
4. 6.93 s
Subtopic: LR circuit |
63%
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NEET - 2024
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A conducting circular loop of face area 2.5×10−3 m2 is placed perpendicular to a magnetic field which varies as B=0.5 sin(100πt) T. The magnitude of induced EMF at time t=0 s is:
1. 0.125π mV
2. 125π mV
3. 125π V
4. 12.5π mV
1. 0.125π mV
2. 125π mV
3. 125π V
4. 12.5π mV
Subtopic: Faraday's Law & Lenz Law |
69%
From NCERT
NEET - 2024
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A rod of length L rotates with a small uniform angular velocity ω about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is:
| 1. | BωL28 | 2. | BωL22 |
| 3. | BωL24 | 4. | zero |
Subtopic: Motional emf |
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NEET - 2024
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Let us consider two solenoids A and B, made from the same magnetic material of relative permeability μr and of equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of B. The ratio of self-inductances of the two solenoids, LA:LB is:
1. 1:2
2. 2:1
3. 8:1
4. 1:8
1. 1:2
2. 2:1
3. 8:1
4. 1:8
Subtopic: Self - Inductance |
66%
From NCERT
NEET - 2024
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The magnetic energy stored in an inductor of inductance 4 μH carrying a current of 2 A is:
1. 8 μJ
2. 4 μJ
3. 4 mJ
4. 8 mJ
1. 8 μJ
2. 4 μJ
3. 4 mJ
4. 8 mJ
Subtopic: Self - Inductance |
77%
From NCERT
NEET - 2023
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An emf is generated by an ac generator having 100 turn coil, of loop area 1 m2. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of 0.05 T perpendicular to the axis of rotation of the coil. The maximum value of emf is:
1. 3.14 V
2. 31.4 V
3. 62.8 V
4. 6.28 V
1. 3.14 V
2. 31.4 V
3. 62.8 V
4. 6.28 V
Subtopic: Motional emf |
75%
From NCERT
NEET - 2023
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A square loop with a side length of 1 m and resistance of 1 Ω is placed in a uniform magnetic field of 0.5 T. The plane of the loop is perpendicular to the direction of the magnetic field. The magnetic flux through the loop is:
1. zero
2. 2 Wb
3. 0.5 Wb
4. 1 Wb
1. zero
2. 2 Wb
3. 0.5 Wb
4. 1 Wb
Subtopic: Magnetic Flux |
69%
From NCERT
NEET - 2022
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A big circular coil with 1000 turns and an average radius of 10 m is rotating about its horizontal diameter at a rate of 2 rad s−1. The vertical component of the Earth's magnetic field at that location is 2×10−5 T, and the electrical resistance of the coil is 12.56 Ω, the maximum induced current in the coil will be:
1. 2 A
2. 0.25 A
3. 1.5 A
4. 1 A
1. 2 A
2. 0.25 A
3. 1.5 A
4. 1 A
Subtopic: Faraday's Law & Lenz Law |
58%
From NCERT
NEET - 2022
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