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

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

 1 from south to the north pole. 2 from north to the south pole. 3 not present. 4 intersecting each other.  Subtopic:  Magnetic Field & Field Lines |
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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 |
85%
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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. T/2

3. 2/T

4. T  Subtopic:  Bar Magnet |
80%
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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 $$3M/ \pi$$ 2 $$2M/ l\pi$$ 3 $$M/ 2$$ 4 $$M$$  Subtopic:  Bar Magnet |
77%
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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 gauss. What will be the intensity at a distance $\frac{x}{2}$ on equatorial position?

1. 9 gauss

2. 4 gauss

3. 36 gauss

4. 4.5 gauss  Subtopic:  Bar Magnet |
75%
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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. $\frac{2{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

2. $\frac{{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

3. Zero

4. $\frac{\sqrt{5}{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$  Subtopic:  Bar Magnet |
67%
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The unit of pole strength is:

1. $A{m}^{2}$

2. Am

3. $\frac{{A}^{2}}{m}$

4. $\frac{{A}^{2}}{{m}^{2}}$  Subtopic:  Bar Magnet |
68%
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