A rectangular metal loop ABCD of is passed through the magnetic field with a constant velocity v. Which of the following represents power (P) dissipated vs time (t) graph?

             


1.                2. 
3.                4. 

Subtopic:  Motional emf |
From NCERT
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Self-inductance of a solenoid is 5 mH. If the current is decreasing through it at the rate 10+3 A/s, then emf induced in the solenoid is

1. -5V

2. 5V

3. 2.5V

4. -2.5V

Subtopic:  Self - Inductance |
 65%
From NCERT
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Keeping number of turns constant self inductance L of a solenoid varies with its length l as

1. Ll

2. L1l

3. Ll2

4. L1l2

Subtopic:  Self - Inductance |
 70%
From NCERT
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A conducting rod AC of length 4l is rotated with angular velocity ω about a point O in a uniform magnetic field B directed into the plane of the paper. If AO = l and OC = 3l, then the potential difference between A and C, VA - VC is

1. 2Bωl2

2. Bωl2

3. 3Bωl2

4. 4Bωl2

Subtopic:  Motional emf |
 75%
From NCERT
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A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the circle. The radius r of the circle changes with time t as shown in the figure. The graph of the magnitude of induced emf e versus time t in the circle is represented by

  


1.              2. 
3.              4. 

Subtopic:  Faraday's Law & Lenz Law | Motional emf |
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A cylindrical space of radius R is filled with a uniform magnetic induction B parallel to the axis of the cylinder. If B changes at a constant rate, the graph showing the variation of the induced electric field with distance r from the axis of the cylinder is

    

1.        2.  
3.       4. 

Subtopic:  Motional emf |
 72%
From NCERT
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A long conducting wire AH is moved over a conducting triangular wire CDE with a constant v in a uniform magnetic field B directed into the plane of the paper. Resistance per unit length of each wire is r. Then

1. A clockwise induced current will flow in the closed-loop.

2. No induced current will flow in the closed-loop.

3. Induced current in the closed-loop alternately changes its direction.

4. An anticlockwise induced, the current will flow in the closed-loop.

Subtopic:  Faraday's Law & Lenz Law |
 67%
From NCERT
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The figure below shows a square loop of side 0.5 m and resistance 10 Ω. The magnetic field has a magnitude B = 1.0 T. The work done in pulling the loop out of the field slowly and uniformly in 2 seconds is

1. 3.125×10-3J

2. 6.25×10-4J

3. 1.25×10-2J

4. 5.0 ×10-4J

Subtopic:  Motional emf |
 55%
From NCERT
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The wires \(\mathrm{P}_1\mathrm{Q}_1\) and \(\mathrm{P}_2\mathrm{Q}_2\) are made to slide on the rails with the same speed \(10~\text{m/s}\). If \(\mathrm{P}_1\mathrm{Q}_1\) moves towards the left and \(\mathrm{P}_2\mathrm{Q}_2\) moves towards the right, then the electric current in the \(19~\Omega\) resistor is:

      

1. zero
2. \(10~\text{mA}\)
3. \(0.1~\text{mA}\)
4. \(1~\text{mA}\)

Subtopic:  Motional emf |
 75%
From NCERT
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The triangular circuit ABC shown in the figure is in a very long solenoid of radius R such that the plane of the triangular circuit is normal to the length of the solenoid. If the magnetic field changes at the rate dB/dt, then the induced emf in the triangular circuit is

1. R3dBdt

2. R2dBdt

3. RdBdt

4. RdBdt

Subtopic:  Faraday's Law & Lenz Law |
 75%
From NCERT
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