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 |
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NEET 2022 - Target Batch - Aryan Raj Singh
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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. R12R2

2. R22R1

3. R1R2

4. R2R1

Subtopic:  Mutual Inductance |
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The magnetic flux linked with a coil (in Wb) is given by the equation ϕ=5t2+3t+60
The magnitude of induced emf in the coil at the fourth second will be:

1.  33 V

2.  43 V

3.  108 V

4.  10 V

Subtopic:  Faraday's Law & Lenz Law |
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A wheel with 20 metallic spokes, each 1 m long, is rotated with a speed of 120 rpm in a plane perpendicular to a magnetic field of 0.4 G. The induced emf between the axle and rim of the wheel will be, ( 1 G =10-4 T ) 

1.  2.51 × 10-4 V

2.  2.51 × 10-5 V

3.  4.0 × 10-5 V

4.  2.51 V

Subtopic:  Motional emf |
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In which of the following devices, the eddy current effect is not used?

1. Electric heater

2. Induction furnace

3. Magnetic braking in train

4. Electromagnet

Subtopic:  Eddy Current |
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A 800 turn coil of effective area 0.05 m2 is kept perpendicular to a magnetic field 5×10-5 T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

1. 0.02 V

2. 2 V

3. 0.2 V

4. 2×10-3 V

Subtopic:  Faraday's Law & Lenz Law |
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A cycle wheel of radius 0.5 m is rotated with a constant angular velocity of 10 rad/s in a region of a magnetic field of 0.1 T which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is:

1. 0.25 V

2. 0.125 V

3. 0.5 V

4. zero

Subtopic:  Motional emf |
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The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance :

1. 0.138 H

2. 138.88 H

3. 1.389 H

4. 13.89 H

Subtopic:  Self - Inductance |
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A long solenoid of diameter 0.1m has 2×104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01m is placed with its axis coinciding with the solenoid's axis.  The current in the solenoid reduces at a constant rate to 0 A from 4A in 0.05s. If the resistance of the coil is 10π2Ω, the total charge flowing through the coil during this time is 

1. 32πμC

2. 16μC

3. 32μC

4. 16πμC

Subtopic:  Faraday's Law & Lenz Law |
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A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate dBdt. Loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the emf generated is-

                  

(1) zero in loop 1 and zero in loop 2

(2) -dBdtπr2 in loop 1 and-dBdtπr2 in loop 2

(3) -dBdtπr2 in loop 1 and zero in loop 2

(4) 2dBdtπr2 in loop 1 and zero in loop 2

Subtopic:  Faraday's Law & Lenz Law |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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