A field of 0.2 T acts perpendicular to a coil of area 100cm2 with 50 turns. If the coil is removed within 0.1s from the field, then the minimum emf induced in the coil is

1. 1 V

2. 2 V

3. 3 V

4. 4 V

Subtopic:  Motional emf |
 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

If by keeping number of turns per unit length constant, the volume of an air-core inductor is doubled, then its self-inductance will become/remain

1. Two times

2. Half

3. Same

4. Four times

Subtopic:  Self - Inductance |
 70%
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

Eddy currents are used in:

1. Induction furnace

2. Electromagnetic brakes

3. Speedometers

4. All of these

Subtopic:  Eddy Current |
 94%
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

A square loop of sides 4 cm having a resistance of 2Ω is placed normal to a magnetic field. If the magnetic field is gradually reduced at the rate of 0.02 T/s. The induced current in the loop is

1. 8 μA

2. 2 μA

3. 16 μA

4. 6 μA

Subtopic:  Faraday's Law & Lenz Law |
 86%
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 direction of the runway on the airport should be

1. Along N-A

2. Along E-W

3. Along NW-SE

4. Along NE-SW

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

A metallic wheel (of radius l and 8 spokes) is rotated in a uniform magnetic field B as shown. The motional EMF across centre and rim is given by

1. 4Bl2ω

2. 2Bl2ω

3. 8Bl2ω

4. 12Bl2ω

Subtopic:  Motional emf |
 74%
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

Charged pollen grains are lying on a frictionless table. These are now subject to a certain field and are found to be moving by these fields. The field cannot be

1. Time-dependent electric field

2. Position dependent electric field

3. Time-dependent magnetic field

4. Position dependent magnetic field

Subtopic:  Faraday's Law & Lenz Law |
 51%
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 magnetic field in the region is decreasing in such a way that dB/dt = γ. If resistance per unit length of the loop shown is λ, then, the current flowing in the loop is given by

1. 2πrγλ Clockwise

2. 2πrγλ Anticlockwise

3. rγ2λ Clockwise

4. rγ2λ Anticlockwise

Subtopic:  Faraday's Law & Lenz Law |
 53%
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

Two inductor coils of self-inductance L1 = 10 H and L2 = 20 H are placed as shown in the figure. The mutual inductance of the coil is 3H. The equivalent inductance between AB of the system of coils is

1. 36 H

2. 24 H

3. 203H

4. 383H

 

Subtopic:  Mutual Inductance |
 56%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

There is a solenoid of length 1.5 m having 1000 turns per metre, kept in a region where the magnetic field is increased with time as 0.2 T s-1. (radius of the solenoid is 10πcm). The current through resistance 10Ω is

1. 30 A

2. 3 A

3. 0.3 A

4. 0.03 A

Subtopic:  Faraday's Law & Lenz Law |
 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