A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is in 

1.  end-on position

2.  broadside-on position

3.  both

4.  none

Subtopic:  Bar Magnet |
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A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the loop is in

1.  end-on position

2.  broadside-on position

3.  both

4.  none

Subtopic:  Bar Magnet |
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When a current in a circular loop is equivalently replaced by a magnetic dipole,

1.   the pole strength m of each pole is fixed

2.   the distance d between the poles is fixed

3.   the product md is fixed

4.   none of the above

Subtopic:  Bar Magnet |
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Let r be the distance of a point on the axis of a bar magnet from its centre. The magnetic field at such a point is proportional to

1.   \(1 \over r\)

2.    \(1 \over r^2\)

3.     \(1 \over r^3\)

4.   none of these

Subtopic:  Bar Magnet |
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Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to

1.   \(1 \over r\)

2.   \(1 \over r^2\)

3.   \(1 \over r^3\)

4.   none of these

Subtopic:  Bar Magnet |
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Two short magnets of equal dipole moments M are fastened perpendicularly at their centres (shown in the figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is

     

1.  \(\frac{\mu_{\mathrm{0}}}{4 \pi} \frac{\mathrm{M}}{\mathrm{d}^{3}}\)

2.  \(\frac{\mu_{0}}{4 \pi} \frac{\sqrt{2} \mathrm{M}}{\mathrm{d}^{3}}\)

3.   \(\frac{\mu_{0}}{4 \pi} \frac{2\sqrt{2} \mathrm{M}}{\mathrm{d}^{3}}\)

4.   \(\frac{\mu_{\mathrm{0}}}{4 \pi} \frac{\mathrm{2M}}{\mathrm{d}^{3}}\)

Subtopic:  Bar Magnet |
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Magnetic meridian is :

1.  a point

2.  a line along north-south

3.  a horizontal plane

4.  a vertical plane

Subtopic:  Earth's Magnetism |
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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It 

1.  will stay in north-south direction only 

2.  will stay in east-west direction only 

3.  will become rigid showing no movement 

4.  will stay in any position

Subtopic:  Earth's Magnetism |
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A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay 

1.  in horizontal direction only 

2.  in vertical direction only 

3.  in any direction except vertical and horizontal 

4.  in any direction it is released

Subtopic:  Earth's Magnetism |
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Which of the following four graphs may best represent the current-deflection relation in a tangent galvanometer? 

  
1. a
2. b 
3. c
4. d

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