The correct direction of the magnetic field in the given figures is shown by:

1.  2.
3. 4.
Subtopic:  Magnetic Field & Field Lines |
 91%
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The magnetic lines of force inside a bar magnet are:

1. from the south to the north pole.
2. from the north to the south pole.
3. not present.
4. intersecting each other.

Subtopic:  Magnetic Field & Field Lines |
 86%
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Which of the following is the correct representation of magnetic field lines?

1. (g), (c) 2. (d), (f)
3. (a), (b) 4. (c), (e)
Subtopic:  Magnetic Field & Field Lines |
 86%
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Which one of the following is correct?

1. The magnetic field lines also represent the lines of force on a moving charged particle at every point.
2. Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.
3. A bar magnet exerts a torque on itself due to its own field.
4. Magnetic field arises due to stationary charges.

Subtopic:  Magnetic Field & Field Lines |
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If a magnetic needle is made to vibrate in uniform field \(H\), then its time period is \(T\). If it vibrates in the field of intensity \(4H\), its time period will be:

1. \(2T\) 2. \(\dfrac{T}{2}\)
3. \(\dfrac{2}{T}\) 4. \(T\)
Subtopic:  Bar Magnet |
 79%
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A bar magnet of length \(l\) and magnetic dipole moment \(M\) is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:

1. \(\dfrac{3M}{\pi}\) 2. \(\dfrac{2M}{l\pi}\)
3. \(\dfrac{M}{ 2}\) 4. \(M\)
Subtopic:  Bar Magnet |
 79%
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AIPMT - 2013
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Due to a small magnet, the intensity at a distance \(x\) in the end-on position is \(9~\text{gauss}\). What will be the intensity at a distance \(\dfrac{x}{2}\) on equatorial position?
1. \(9~\text{gauss}\) 2. \(4~\text{gauss}\)
3. \(36~\text{gauss}\) 4. \(4.5~\text{gauss}\)
Subtopic:  Bar Magnet |
 74%
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A long magnetic needle of length \(2L\), magnetic moment \(M\) and pole strength \(m\) units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be:
1. \(\frac{M}{2} , \frac{m}{2}\)
2. \(M , \frac{m}{2}\)
3. \(\frac{M}{2} , m\)
4. \(M, m\)

Subtopic:  Bar Magnet |
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Figure shows two small identical magnetic dipoles \(a\) and \(b\) of magnetic moments \(M\) each, placed at a separation \(2d\), with their axes perpendicular to each other. The magnetic field at the point \(P\) midway between the dipoles is:

         
 

1. \(\dfrac{2 \mu_{0} M}{4 \pi d^{3}}\) 2. \(\dfrac{\mu_{0} M}{4 \pi d^{3}}\)
3. zero 4. \(\dfrac{\sqrt{5}\mu_{0} M}{4\pi d^{3}}\)
Subtopic:  Bar Magnet |
 69%
From NCERT
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The unit of pole strength is:
1. \(\text{Am}^2\)
2. \(\text{Am}\)
3. \(\frac{\text{A}^2}{\text{m}}\)
4. \(\frac{\text{A}^2}{\text{m}^2}\)

Subtopic:  Bar Magnet |
 70%
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