Calculate the self-inductance of a solenoid having 1000 turns and length 1 m. The area of cross-section is 7 cm2 and \(\mu_r=1000\)

1. 888 H

2. 0.88 H

3. 0.088 H

4. 88.8 H

Subtopic:  Self - Inductance |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Two discs of radii R and 2R are moving with velocities v and 2v in opposite directions on a conducting platform, as shown in the figure. If magnetic field B is applied in the plane perpendicular to the discs, then the potential difference between two points P and Q which are the topmost points of the discs is 

1. 8BRv

2. 4BRv

3. 10BRv

4. 2BRv

 

Subtopic:  Motional emf |
 55%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

What is the effective self-inductance of two solenoids in series-wound on a core as shown in the figure, if L is the self-inductance of each solenoid?

1. L

2. 2L

3. L/2

4. Zero

Subtopic:  Self - Inductance |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A uniform conductor having length l is moving in uniform magnetic field B with speed v. If B, l and v are mutually perpendicular and R is the resistance of the conductor, then the power delivered by the external source is

1. B2l2v2/2R

2. 2B2l2v2/R

3. B2l2v2/R

4. Zero

Subtopic:  Motional emf |
 80%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A circular ring of radius \(r\) is at the centre of a square having side  \(a\left ( a\gg r \right ).\) The mutual inductance of the system is:
1. \( \frac{\mu_0 r^2}{a}\)

2. \( \frac{\sqrt{2} \mu_0 r^2}{\pi} \)

3. \(\frac{2 \sqrt{2} \mu_0 r^2}{a}\)

4. \( \frac{2 \sqrt{2} \mu_0 r^2}{\pi a}\)

Subtopic:  Mutual Inductance |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If a semicircular conducting loop ACB is rotating in the plane of paper with constant angular velocity ω about O, then which of the following graphs shows the variation of induced current (l) with time (t)? The magnetic field is perpendicular to the plane of the loop as shown in the figure.
              

1.                  2. 
3.               4. 

Subtopic:  Motional emf |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A current-carrying cable is penetrating a loop as shown in the figure. If the magnitude of the current is decreasing with time, then the current induced in the loop is

1. Zero

2. Clockwise

3. Anticlockwise

4. Depends on the magnitude of the current

Subtopic:  Motional emf |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A solenoid has an inductance of 20 H and a resistance of 5 ohms. It is connected to a battery of 20 volts. The maximum magnetic energy stored in the magnetic field of the solenoid is

1. 40 J

2. 160 J

3. 320 J

4. 80 J

Subtopic:  Self - Inductance |
 88%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The slotting processes in a metallic sheet results in:

1. The increase of the resistance in the path for circulation of current.
2. Decrease in the strength of eddy current.
3. A feeble in the electromagnetic damping.
4. All of these
Subtopic:  Eddy Current |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The square loop shown below is rotated about the axis PQ and magnetic field is perpendicular to the plane of the paper. The magnitude of induced emf in the loop is minimum when the plane of the loop:

1. is perpendicular to the plane of the paper.

2. is parallel to the plane of the paper.

3. makes 45° angle with the plane of the paper.

4. makes 60° angle with the plane of the paper.

Subtopic:  Motional emf |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh