A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. What will the magnetic field be at the centre of this n-turn coil?

1. nB 2. n2B
3. 2nB 4. 2n2B
Subtopic:  Magnetic Field due to various cases |
 83%
From NCERT
NEET - 2016
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The magnetic induction at point P, which is 4 cm from a long current-carrying wire is 10-8 Tesla. What would be the field of induction at a distance of 12 cm from the same current?

1. 3.33 x 10-9 Tesla   
2. 1.11 x 10-4 Tesla
3. 3 x 10-3 Tesla
4. 9 x 10-2 Tesla


 

Subtopic:  Magnetic Field due to various cases |
 81%
From NCERT
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Two similar coils of radius \(R\) are lying concentrically with their planes at right angles to each other. The currents flowing in them are \(I\) and \(2I,\) respectively. What will be the resultant magnetic field induction at the centre?
1. \(\sqrt{5} \mu_0I \over 2R\)
2. \({3} \mu_0I \over 2R\)
3. \( \mu_0I \over 2R\)
4. \( \mu_0I \over R\)

Subtopic:  Magnetic Field due to various cases |
 80%
From NCERT
AIPMT - 2012
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The resistances of three parts of a circular loop are as shown in the figure. What will be the magnetic field at the centre of O 
(current enters at A and leaves at B and C as shown)?

 

1.  μ0I6a

2.  μ0I3a

3.  2μ0I3a

4.  0

Subtopic:  Magnetic Field due to various cases |
 82%
From NCERT
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Which of the following graphs correctly represents the variation of magnetic field induction with distance due to a thin wire carrying current?

1. 2.
3. 4.
Subtopic:  Magnetic Field due to various cases |
 80%
From NCERT
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What is the magnetic field at point O in the figure?
                    

1.  μ0I4πr                                  
2.  μ0I4πr+μ0I2πr
3.  μ0I4r+μ0I4πr                        
4.  μ0I4r-μ0I4πr

Subtopic:  Magnetic Field due to various cases |
 78%
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Two identical long conducting wires \(\mathrm{AOB}\) and \(\mathrm{COD}\) are placed at a right angle to each other, with one above the other such that '\(O\)' is the common point for the two. The wires carry \(I_1\) and \(I_2\) currents, respectively. Point '\(P\)' is lying at a distance '\(d\)' from '\(O\)' along a direction perpendicular to the plane containing the wires. What will be the magnetic field at the point \(P\)?
1. \(\frac{\mu_0}{2\pi d}\left(\frac{I_1}{I_2}\right )\)
2. \(\frac{\mu_0}{2\pi d}\left[I_1+I_2\right ]\)
3. \(\frac{\mu_0}{2\pi d}\left[I^2_1+I^2_2\right ]\)
4. \(\frac{\mu_0}{2\pi d}\sqrt{\left[I^2_1+I^2_2\right ]}\)

Subtopic:  Magnetic Field due to various cases |
 75%
From NCERT
AIPMT - 2014
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If the magnetic field at the centre of the circular coil is B0, then what is the distance on its axis from the centre of the coil where  \(B_x=\frac{B_0}{8}~?\)
(R= radius of the coil)

1. \(R \over 3\) 2. \(\sqrt{3}R\)
3. \(R \over \sqrt3\) 4. \(R \over 2\)
Subtopic:  Magnetic Field due to various cases |
 73%
From NCERT
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In the figure shown below there are two semicircles of radius r1 and r2 in which a current i is flowing. The magnetic induction at the centre of O will be:

       

1.  μ0irr1+r2                           

2.  μ0i4r1+r2r1r2

3.  μ0i4(r1-r2)                             

4. μ0i4r2-r1r1r2  

Subtopic:  Magnetic Field due to various cases |
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A ring of radius R carries a linear charge density λ. It is rotating with angular speed ω about an axis passing through the centre and perpendicular to the plane. What is the magnetic field at its centre?

1.  3μ0λω2

2.  μ0λω2

3.  μ0λωπ

4.  μ0λω  

Subtopic:  Magnetic Field due to various cases |
 71%
From NCERT
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