A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf is

(1) once per revolution

(2) twice per revolution

(3) four times per revolution

(4) six times per revolution




Subtopic:  Faraday's Law & Lenz Law |
 74%
From NCERT
NEET - 2013
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A coil of resistance 400Ω is placed in a magnetic field. If the magnetic flux ϕ Wb linked with the coil varies with time t (sec) as ϕ=50t2+4.

The current in the coil at t=2s is 

(1) 0.5A                                           

(2) 0.1A

(3) 2A                                               

(4) 1A

Subtopic:  Faraday's Law & Lenz Law |
 87%
From NCERT
NEET - 2012
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A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is

1. 3.2 πμV                                      2. 4.8 πμV

3. 0.8 πμV                                      4. 1.6 πμV

Subtopic:  Faraday's Law & Lenz Law |
 67%
From NCERT
NEET - 2009
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A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity, v=vi^. The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for 

(1) the rectangular, circular and elliptical loops

(2) the circular and the elliptical loops

(3) only the elliptical loop

(4) any of the four loops

Subtopic:  Motional emf |
 70%
From NCERT
NEET - 2009
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a long solenoid has 500 turns. When a current of 2 A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4×10-3 Wh.  The self-inductance of the solenoid is 

(a) 2.5 h

(b) 2.0 H 

(c) 1.0 H

(d) 4.0 H

 

Subtopic:  Self - Inductance |
 76%
From NCERT
NEET - 2008
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A circular disc of radius \(0.2\) m is placed in a uniform magnetic field of induction \(\frac{1}{\pi} \left(\frac{\text{Wb}}{\text{m}^{2}}\right)\) in such a way that its axis makes an angle of \(60^{\circ}\) with \(\vec {B}.\) The magnetic flux linked to the disc will be:

1. \(0.02\) Wb 2. \(0.06\) Wb
3. \(0.08\) Wb 4. \(0.01\) Wb
Subtopic:  Magnetic Flux |
 86%
From NCERT
NEET - 2008
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An electron moves on a straight-line path \(XY\) as shown. The \(abcd\) is a coil adjacent to the path of the electron. What will be the direction of the current, if any induced in the coil?
             

1. \(abcd\)
2. \(adcb\)
3. The current will reverse its direction as the electron goes past the coil.
4. No current is induced.
Subtopic:  Faraday's Law & Lenz Law |
 69%
From NCERT
NEET - 2015
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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 |
 75%
From NCERT
NEET - 2016
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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 |
 58%
From NCERT
NEET - 2017
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If induction of magnetic field at a point is B and energy density is U, then which of the following graphs is correct?

1. 

2. 

3. 
4. 

Subtopic:  Self - Inductance |
 62%
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