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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 |

63%

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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 |

52%

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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 |

59%

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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. \(\dfrac 1 r\)

2. \(\dfrac 1 {r^2}\)

3. \(\dfrac 1 {r^3}\)

4. none of these

Subtopic: Bar Magnet |

73%

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Two short magnets of equal dipole moments \(\mathrm{M}\) are fastened perpendicularly at their centres (shown in the figure). The magnitude of the magnetic field at a distance \(\mathrm{d}\) 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 |

55%

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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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A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled, the deflection will

1. increase

2. decrease

3. remain unchanged

4. either increase or decrease.

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Pick the correct options.

(a) | The magnetic field is produced only by electric charges. |

(b) | Magnetic poles are only mathematical assumptions having no real existence. |

(c) | A north pole is equivalent to a clockwise current and a south pole is equivalent to an anticlockwise current. |

(d) | A bar magnet is equivalent to a long, straight current. |

Choose the correct option.

1. | (a) , (b) | 2. | (b) , (c) |

3. | (c) , (d) | 4. | (a) , (d) |

Subtopic: Magnetic Materials |

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A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole S and a north pole N.

(a) The line SN should be along a diameter of the loop.

(b) The line SN should be perpendicular to the plane of the loop.

(c) The south pole should be below the loop.

(d) The north pole should be below the loop

Choose the correct option

1. (a) , (b)

2. (b) , (d)

3. (c) , (d)

4. (a) , (d)

Subtopic: Bar Magnet |

74%

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