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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 |

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A magnet of magnetic dipole moment \(10\hat{i}\) A-m^{2} is placed along the x-axis in a magnetic field \(\vec B=(\widehat i+2\widehat j)\) T. The torque acting on the magnet is:

1. \((30\widehat k)\) N-m

2. \((10\widehat i+20\widehat j)\) N-m

3. \((20\widehat k)\) N-m

4. \((-30\widehat k)\) N-m

1. \((30\widehat k)\) N-m

2. \((10\widehat i+20\widehat j)\) N-m

3. \((20\widehat k)\) N-m

4. \((-30\widehat k)\) N-m

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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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%

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Two identical bar magnets are kept as shown in the figure. The direction of the resultant magnetic field, indicated by the arrowhead at the point \(\text{P}\) is:

1. | |

2. | |

3. | |

4. |

Subtopic: Magnetic Field & Field Lines |

56%

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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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The unit of magnetic flux is:

1. Oersted

2. Gauss

3. Tesla

4. Maxwell

1. Oersted

2. Gauss

3. Tesla

4. Maxwell

Subtopic: Magnetic Field & Field Lines |

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A bar magnet having a magnetic moment of \(2.0\times10^{5}~\text{JT}^{-1}\) is placed along the direction of the uniform magnetic field of magnitude, \(B=14\times10^{-5}~\text{T}\). The work done in rotating the magnet slowly through \(60^\circ \) from the direction of the field is:

1. \(14~\text{J}\)

2. \(8.4~\text{J}\)

3. \(4~\text{J}\)

4. \(1.4~\text{J}\)

1. \(14~\text{J}\)

2. \(8.4~\text{J}\)

3. \(4~\text{J}\)

4. \(1.4~\text{J}\)

Subtopic: Bar Magnet |

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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 |

80%

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A \(100\)-turn coil of wire of size \(2~\mathrm{cm}\times 1.5~\mathrm{cm}\) is suspended between the poles of a magnet producing a field of \(1\) T, inside a galvanometer. Calculate the torque on the coil due to a current of \(0.1~\mathrm{A}\) passing through the coil.

1. \(3 \times 10^{-5}\) N-m

2. \(30\) N-m

3. \(3 \times 10^{-3}\) N-m

4. \(3 \times 10^{-2}\) N-m

1. \(3 \times 10^{-5}\) N-m

2. \(30\) N-m

3. \(3 \times 10^{-3}\) N-m

4. \(3 \times 10^{-2}\) N-m

Subtopic: Bar Magnet |

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