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

1. | 2. | ||

3. | 4. |

Subtopic: Magnetic Field & Field Lines |

91%

From NCERT

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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 |

85%

From NCERT

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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 4*H*, its time period will be:

1. 2T

2. T/2

3. 2/T

4. T

Subtopic: Bar Magnet |

79%

From NCERT

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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. | \(\frac{3M}{\pi}\) | 2. | \(\frac{2M}{l\pi}\) |

3. | \(\frac{M}{ 2}\) | 4. | \(M\) |

Subtopic: Bar Magnet |

77%

From NCERT

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 \(\frac{x}{2}\) on equatorial position?

1. \(9~\text{gauss}\)

2. \(4~\text{gauss}\)

3. \(36~\text{gauss}\)

4. \(4.5~\text{gauss}\)

Subtopic: Bar Magnet |

74%

From NCERT

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A long magnetic needle of length 2*L*, 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 |

74%

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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%

From NCERT

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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 |

69%

From NCERT

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