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प्रश्न
Define the Isogonic line.
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उत्तर
A line that joins all the places on earth, having the same angle of declination is called an isogonic line.
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संबंधित प्रश्न
Draw a diagram to show the magnetic field lines around a bar magnet.
Which of the following statements is incorrect regarding magnetic field lines?
(a) The direction of magnetic field at a point is taken to be the direction in which the north pole a magnetic compass needle points.
(b) Magnetic field lines are closed curves.
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength.
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines.
Copy the figure below which shows a plotting compass and a magnet. Label the N pole of the magnet and draw field line on which the compass lines
The strength of the magnetic field between the poles of an electromagnet would be unchanged if:
How will you test whether a given rod is made of iron or copper?
[Hint : Iron rod gets magnetised when placed near a bar magnet by magnetic induction, while copper rod does not get magnetised]
Explain the following :
Several soft iron pins can cling, one below the other, from the pole of a magnet.
Explain why iron filings which are sprinkled on a sheet of cardboard placed over a bar magnet take up a definite pattern when cardboard is slightly tapped.
Draw diagram showing the arrangement of the lines of force for a single magnet.
State the inference drawn about the direction of the magnetic field lines on the basis of the following diagrams.
 |
 |
| Figure 'a' | Figure 'b' |
Assertion (A): Magnetic field lines never intersect each other.
Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
